/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include #include #include #include static int smb_delete_check_path(smb_request_t *, boolean_t *); static int smb_delete_single_file(smb_request_t *, smb_error_t *); static int smb_delete_multiple_files(smb_request_t *, smb_error_t *); static int smb_delete_find_fname(smb_request_t *, smb_odir_t *); static int smb_delete_check_attr(smb_request_t *, smb_error_t *); static int smb_delete_remove_file(smb_request_t *, smb_error_t *); static void smb_delete_error(smb_error_t *, uint32_t, uint16_t, uint16_t); /* * smb_com_delete * * The delete file message is sent to delete a data file. The appropriate * Tid and additional pathname are passed. Read only files may not be * deleted, the read-only attribute must be reset prior to file deletion. * * NT supports a hidden permission known as File Delete Child (FDC). If * the user has FullControl access to a directory, the user is permitted * to delete any object in the directory regardless of the permissions * on the object. * * Client Request Description * ================================== ================================= * UCHAR WordCount; Count of parameter words = 1 * USHORT SearchAttributes; * USHORT ByteCount; Count of data bytes; min = 2 * UCHAR BufferFormat; 0x04 * STRING FileName[]; File name * * Multiple files may be deleted in response to a single request as * SMB_COM_DELETE supports wildcards * * SearchAttributes indicates the attributes that the target file(s) must * have. If the attribute is zero then only normal files are deleted. If * the system file or hidden attributes are specified then the delete is * inclusive -both the specified type(s) of files and normal files are * deleted. Attributes are described in the "Attribute Encoding" section * of this document. * * If bit0 of the Flags2 field of the SMB header is set, a pattern is * passed in, and the file has a long name, then the passed pattern much * match the long file name for the delete to succeed. If bit0 is clear, a * pattern is passed in, and the file has a long name, then the passed * pattern must match the file's short name for the deletion to succeed. * * Server Response Description * ================================== ================================= * UCHAR WordCount; Count of parameter words = 0 * USHORT ByteCount; Count of data bytes = 0 * * 4.2.10.1 Errors * * ERRDOS/ERRbadpath * ERRDOS/ERRbadfile * ERRDOS/ERRnoaccess * ERRDOS/ERRbadshare # returned by NT for files that are already open * ERRHRD/ERRnowrite * ERRSRV/ERRaccess * ERRSRV/ERRinvdevice * ERRSRV/ERRinvid * ERRSRV/ERRbaduid */ smb_sdrc_t smb_pre_delete(smb_request_t *sr) { int rc; smb_fqi_t *fqi; fqi = &sr->arg.dirop.fqi; if ((rc = smbsr_decode_vwv(sr, "w", &fqi->srch_attr)) == 0) rc = smbsr_decode_data(sr, "%S", sr, &fqi->path); DTRACE_SMB_2(op__Delete__start, smb_request_t *, sr, smb_fqi_t *, fqi); return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR); } void smb_post_delete(smb_request_t *sr) { DTRACE_SMB_1(op__Delete__done, smb_request_t *, sr); } /* * smb_com_delete * * 1. pre-process pathname - smb_delete_check_path() * checks dot, bad path syntax, wildcards in path * * 2. process the path to get directory node & last_comp, * store these in fqi * - If smb_pathname_reduce cannot find the specified path, * the error (ENOTDIR) is translated to NT_STATUS_OBJECT_PATH_NOT_FOUND * if the target is a single file (no wildcards). If there are * wildcards in the last_comp, NT_STATUS_OBJECT_NAME_NOT_FOUND is * used instead. * - If the directory node is the mount point and the last component * is ".." NT_STATUS_OBJECT_PATH_SYNTAX_BAD is returned. * * 3. check access permissions * * 4. invoke the appropriate deletion routine to find and remove * the specified file(s). * - if target is a single file (no wildcards) - smb_delete_single_file * - if the target contains wildcards - smb_delete_multiple_files * * Returns: SDRC_SUCCESS or SDRC_ERROR */ smb_sdrc_t smb_com_delete(smb_request_t *sr) { int rc; smb_error_t err; uint32_t status; boolean_t wildcards; smb_fqi_t *fqi; fqi = &sr->arg.dirop.fqi; if (smb_delete_check_path(sr, &wildcards) != 0) return (SDRC_ERROR); rc = smb_pathname_reduce(sr, sr->user_cr, fqi->path, sr->tid_tree->t_snode, sr->tid_tree->t_snode, &fqi->dir_snode, fqi->last_comp); if (rc == 0) { if (fqi->dir_snode->vp->v_type != VDIR) { smb_node_release(fqi->dir_snode); rc = ENOTDIR; } } if (rc != 0) { if (rc == ENOTDIR) { if (wildcards) status = NT_STATUS_OBJECT_NAME_NOT_FOUND; else status = NT_STATUS_OBJECT_PATH_NOT_FOUND; smbsr_error(sr, status, ERRDOS, ERROR_FILE_NOT_FOUND); } else { smbsr_errno(sr, rc); } return (SDRC_ERROR); } if ((fqi->dir_snode == sr->tid_tree->t_snode) && (strcmp(fqi->last_comp, "..") == 0)) { smb_node_release(fqi->dir_snode); smbsr_error(sr, NT_STATUS_OBJECT_PATH_SYNTAX_BAD, ERRDOS, ERROR_BAD_PATHNAME); return (SDRC_ERROR); } rc = smb_fsop_access(sr, sr->user_cr, fqi->dir_snode, FILE_LIST_DIRECTORY); if (rc != 0) { smb_node_release(fqi->dir_snode); smbsr_error(sr, NT_STATUS_ACCESS_DENIED, ERRDOS, ERROR_ACCESS_DENIED); return (SDRC_ERROR); } if (wildcards) rc = smb_delete_multiple_files(sr, &err); else rc = smb_delete_single_file(sr, &err); smb_node_release(fqi->dir_snode); if (rc != 0) smbsr_set_error(sr, &err); else rc = smbsr_encode_empty_result(sr); return (rc == 0 ? SDRC_SUCCESS : SDRC_ERROR); } /* * smb_delete_single_file * * Find the specified file and, if its attributes match the search * criteria, delete it. * * Returns 0 - success (file deleted) * -1 - error, err is populated with error details */ static int smb_delete_single_file(smb_request_t *sr, smb_error_t *err) { smb_fqi_t *fqi; smb_attr_t ret_attr; uint32_t status; fqi = &sr->arg.dirop.fqi; status = smb_validate_object_name(fqi->path, 0); if (status != NT_STATUS_SUCCESS) { smb_delete_error(err, status, ERRDOS, ERROR_INVALID_NAME); return (-1); } if (smb_fsop_lookup_name(sr, sr->user_cr, 0, sr->tid_tree->t_snode, fqi->dir_snode, fqi->last_comp, &fqi->last_snode, &ret_attr) != 0) { smb_delete_error(err, NT_STATUS_OBJECT_NAME_NOT_FOUND, ERRDOS, ERROR_FILE_NOT_FOUND); return (-1); } if (smb_delete_check_attr(sr, err) != 0) { smb_node_release(fqi->last_snode); return (-1); } if (smb_delete_remove_file(sr, err) != 0) { smb_node_release(fqi->last_snode); return (-1); } smb_node_release(fqi->last_snode); return (0); } /* * smb_delete_multiple_files * * For each matching file found by smb_delete_find_fname: * 1. lookup file * 2. check the file's attributes * - The search ends with an error if a readonly file * (NT_STATUS_CANNOT_DELETE) is matched. * - The search ends (but not an error) if a directory is * matched and the request's search did not include * directories. * - Otherwise, if smb_delete_check_attr fails the file * is skipped and the search continues (at step 1) * 3. delete the file * * Returns 0 - success * -1 - error, err is populated with error details */ static int smb_delete_multiple_files(smb_request_t *sr, smb_error_t *err) { int rc, deleted = 0; smb_fqi_t *fqi; smb_attr_t ret_attr; uint16_t odid; smb_odir_t *od; fqi = &sr->arg.dirop.fqi; /* * Specify all search attributes (SMB_SEARCH_ATTRIBUTES) so that * delete-specific checking can be done (smb_delete_check_attr). */ if ((odid = smb_odir_open(sr, fqi->path, SMB_SEARCH_ATTRIBUTES)) == 0) return (-1); if ((od = smb_tree_lookup_odir(sr->tid_tree, odid)) == NULL) return (-1); for (;;) { rc = smb_delete_find_fname(sr, od); if (rc != 0) break; rc = smb_fsop_lookup_name(sr, sr->user_cr, 0, sr->tid_tree->t_snode, fqi->dir_snode, fqi->last_comp_od, &fqi->last_snode, &ret_attr); if (rc != 0) break; if (smb_delete_check_attr(sr, err) != 0) { smb_node_release(fqi->last_snode); if (err->status == NT_STATUS_CANNOT_DELETE) { smb_odir_release(od); smb_odir_close(od); return (-1); } if ((err->status == NT_STATUS_FILE_IS_A_DIRECTORY) && (SMB_SEARCH_DIRECTORY(fqi->srch_attr) != 0)) break; continue; } if (smb_delete_remove_file(sr, err) == 0) { ++deleted; smb_node_release(fqi->last_snode); continue; } if (err->status == NT_STATUS_OBJECT_NAME_NOT_FOUND) { smb_node_release(fqi->last_snode); continue; } smb_odir_release(od); smb_odir_close(od); smb_node_release(fqi->last_snode); return (-1); } smb_odir_release(od); smb_odir_close(od); if ((rc != 0) && (rc != ENOENT)) { smbsr_map_errno(rc, err); return (-1); } if (deleted == 0) { smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, ERRDOS, ERROR_FILE_NOT_FOUND); return (-1); } return (0); } /* * smb_delete_find_fname * * Find next filename that matches search pattern (fqi->last_comp) * and save it in fqi->last_comp_od. * * Case insensitivity note: * If the tree is case insensitive and there's a case conflict * with the name returned from smb_odir_read, smb_delete_find_fname * performs case conflict name mangling to produce a unique filename. * This ensures that any subsequent smb_fsop_lookup, (which will * find the first case insensitive match) will find the correct file. * * Returns: 0 - success * errno */ static int smb_delete_find_fname(smb_request_t *sr, smb_odir_t *od) { int rc; smb_odirent_t *odirent; boolean_t eos; char *name; char shortname[SMB_SHORTNAMELEN]; char name83[SMB_SHORTNAMELEN]; smb_fqi_t *fqi; fqi = &sr->arg.dirop.fqi; odirent = kmem_alloc(sizeof (smb_odirent_t), KM_SLEEP); rc = smb_odir_read(sr, od, odirent, &eos); if (rc != 0) { kmem_free(odirent, sizeof (smb_odirent_t)); return (rc); } if (eos) { kmem_free(odirent, sizeof (smb_odirent_t)); return (ENOENT); } /* if case conflict, force mangle and use shortname */ if ((od->d_ignore_case) && (odirent->od_eflags & ED_CASE_CONFLICT)) { (void) smb_mangle_name(odirent->od_ino, odirent->od_name, shortname, name83, 1); name = shortname; } else { name = odirent->od_name; } (void) strlcpy(fqi->last_comp_od, name, sizeof (fqi->last_comp_od)); kmem_free(odirent, sizeof (smb_odirent_t)); return (0); } /* * smb_delete_check_attr * * Check file's dos atributes to ensure that * 1. the file is not a directory - NT_STATUS_FILE_IS_A_DIRECTORY * 2. the file is not readonly - NT_STATUS_CANNOT_DELETE * 3. the file's dos attributes comply with the specified search attributes * If the file is either hidden or system and those attributes * are not specified in the search attributes - NT_STATUS_NO_SUCH_FILE * * Returns: 0 - file's attributes pass all checks * -1 - err populated with error details */ static int smb_delete_check_attr(smb_request_t *sr, smb_error_t *err) { smb_fqi_t *fqi; smb_node_t *node; uint16_t dosattr, sattr; fqi = &sr->arg.dirop.fqi; sattr = fqi->srch_attr; node = fqi->last_snode; dosattr = smb_node_get_dosattr(node); if (dosattr & FILE_ATTRIBUTE_DIRECTORY) { smb_delete_error(err, NT_STATUS_FILE_IS_A_DIRECTORY, ERRDOS, ERROR_ACCESS_DENIED); return (-1); } if (SMB_PATHFILE_IS_READONLY(sr, node)) { smb_delete_error(err, NT_STATUS_CANNOT_DELETE, ERRDOS, ERROR_ACCESS_DENIED); return (-1); } if ((dosattr & FILE_ATTRIBUTE_HIDDEN) && !(SMB_SEARCH_HIDDEN(sattr))) { smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, ERRDOS, ERROR_FILE_NOT_FOUND); return (-1); } if ((dosattr & FILE_ATTRIBUTE_SYSTEM) && !(SMB_SEARCH_SYSTEM(sattr))) { smb_delete_error(err, NT_STATUS_NO_SUCH_FILE, ERRDOS, ERROR_FILE_NOT_FOUND); return (-1); } return (0); } /* * smb_delete_remove_file * * For consistency with Windows 2000, the range check should be done * after checking for sharing violations. Attempting to delete a * locked file will result in sharing violation, which is the same * thing that will happen if you try to delete a non-locked open file. * * Note that windows 2000 rejects lock requests on open files that * have been opened with metadata open modes. The error is * STATUS_ACCESS_DENIED. * * NT does not always close a file immediately, which can cause the * share and access checking to fail (the node refcnt is greater * than one), and the file doesn't get deleted. Breaking the oplock * before share and access checking gives the client a chance to * close the file. * * Returns: 0 - success * -1 - error, err populated with error details */ static int smb_delete_remove_file(smb_request_t *sr, smb_error_t *err) { int rc; uint32_t status; smb_fqi_t *fqi; smb_node_t *node; fqi = &sr->arg.dirop.fqi; node = fqi->last_snode; (void) smb_oplock_break(node, sr->session, B_FALSE); smb_node_start_crit(node, RW_READER); status = smb_node_delete_check(node); if (status != NT_STATUS_SUCCESS) { smb_delete_error(err, NT_STATUS_SHARING_VIOLATION, ERRDOS, ERROR_SHARING_VIOLATION); smb_node_end_crit(node); return (-1); } status = smb_range_check(sr, node, 0, UINT64_MAX, B_TRUE); if (status != NT_STATUS_SUCCESS) { smb_delete_error(err, NT_STATUS_ACCESS_DENIED, ERRDOS, ERROR_ACCESS_DENIED); smb_node_end_crit(node); return (-1); } rc = smb_fsop_remove(sr, sr->user_cr, node->dir_snode, node->od_name, 1); if (rc != 0) { if (rc == ENOENT) smb_delete_error(err, NT_STATUS_OBJECT_NAME_NOT_FOUND, ERRDOS, ERROR_FILE_NOT_FOUND); else smbsr_map_errno(rc, err); smb_node_end_crit(node); return (-1); } smb_node_end_crit(node); return (0); } /* * smb_delete_check_path * * Perform initial validation on the pathname and last_comp. * * wildcards in path: * Wildcards in the path (excluding the last_comp) should result * in NT_STATUS_OBJECT_NAME_INVALID. * * bad path syntax: * On unix .. at the root of a file system links to the root. Thus * an attempt to lookup "/../../.." will be the same as looking up "/" * CIFs clients expect the above to result in * NT_STATUS_OBJECT_PATH_SYNTAX_BAD. It is currently not possible * (and questionable if it's desirable) to deal with all cases * but paths beginning with \\.. are handled. See bad_paths[]. * Cases like "\\dir\\..\\.." will be caught and handled after the * pnreduce. Cases like "\\dir\\..\\..\\filename" will still result * in "\\filename" which is contrary to windows behavior. * * dot: * A filename of '.' should result in NT_STATUS_OBJECT_NAME_INVALID * Any wildcard filename that resolves to '.' should result in * NT_STATUS_OBJECT_NAME_INVALID if the search attributes include * FILE_ATTRIBUTE_DIRECTORY * * Returns: * 0: path is valid. Sets *wildcard to TRUE if wildcard delete * i.e. if wildcards in last component * -1: path is invalid. Sets error information in sr. */ static int smb_delete_check_path(smb_request_t *sr, boolean_t *wildcard) { smb_fqi_t *fqi = &sr->arg.dirop.fqi; char *p, *last_comp; int i, wildcards; struct { char *name; int len; } *bad, bad_paths[] = { {"\\..\0", 4}, {"\\..\\", 4}, {"..\0", 3}, {"..\\", 3} }; /* find last component, strip trailing '\\' */ p = fqi->path + strlen(fqi->path) - 1; while (*p == '\\') { *p = '\0'; --p; } if ((p = strrchr(fqi->path, '\\')) == NULL) last_comp = fqi->path; else last_comp = ++p; wildcards = smb_convert_wildcards(last_comp); if (last_comp != fqi->path) { /* * Wildcards are only allowed in the last component. * Check for additional wildcards in the path. */ if (smb_convert_wildcards(fqi->path) != wildcards) { smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID, ERRDOS, ERROR_INVALID_NAME); return (-1); } } /* path above the mount point */ for (i = 0; i < sizeof (bad_paths) / sizeof (bad_paths[0]); ++i) { bad = &bad_paths[i]; if (strncmp(fqi->path, bad->name, bad->len) == 0) { smbsr_error(sr, NT_STATUS_OBJECT_PATH_SYNTAX_BAD, ERRDOS, ERROR_BAD_PATHNAME); return (-1); } } /* last component is, or resolves to, '.' (dot) */ if ((strcmp(last_comp, ".") == 0) || (SMB_SEARCH_DIRECTORY(fqi->srch_attr) && (smb_match(last_comp, ".")))) { smbsr_error(sr, NT_STATUS_OBJECT_NAME_INVALID, ERRDOS, ERROR_INVALID_NAME); return (-1); } *wildcard = (wildcards != 0); return (0); } /* * smb_delete_error */ static void smb_delete_error(smb_error_t *err, uint32_t status, uint16_t errcls, uint16_t errcode) { err->severity = ERROR_SEVERITY_ERROR; err->status = status; err->errcls = errcls; err->errcode = errcode; }