1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2021 Gleb Popov 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 /* 29 * acl_equiv_mode_np: Check if an ACL can be represented as a mode_t. 30 */ 31 32 #include <sys/cdefs.h> 33 #include <sys/types.h> 34 #include <sys/param.h> 35 #include <sys/errno.h> 36 #include <sys/stat.h> 37 #include <sys/acl.h> 38 39 #include "acl_support.h" 40 41 int 42 acl_equiv_mode_np(acl_t acl, mode_t *mode_p) 43 { 44 mode_t ret_mode = 0; 45 46 if (acl == NULL) { 47 errno = EINVAL; 48 return (-1); 49 } 50 51 /* Linux returns 0 for ACL returned by acl_init() */ 52 if (_acl_brand(acl) == ACL_BRAND_UNKNOWN && acl->ats_acl.acl_cnt == 0) 53 return (0); 54 55 // TODO: Do we want to handle ACL_BRAND_NFS4 in this function? */ 56 if (_acl_brand(acl) != ACL_BRAND_POSIX) 57 return (1); 58 59 for (int cur_entry = 0; cur_entry < acl->ats_acl.acl_cnt; cur_entry++) { 60 acl_entry_t entry = &acl->ats_acl.acl_entry[cur_entry]; 61 62 if ((entry->ae_perm & ACL_PERM_BITS) != entry->ae_perm) 63 return (1); 64 65 switch (entry->ae_tag) { 66 case ACL_USER_OBJ: 67 if (entry->ae_perm & ACL_READ) 68 ret_mode |= S_IRUSR; 69 if (entry->ae_perm & ACL_WRITE) 70 ret_mode |= S_IWUSR; 71 if (entry->ae_perm & ACL_EXECUTE) 72 ret_mode |= S_IXUSR; 73 break; 74 case ACL_GROUP_OBJ: 75 if (entry->ae_perm & ACL_READ) 76 ret_mode |= S_IRGRP; 77 if (entry->ae_perm & ACL_WRITE) 78 ret_mode |= S_IWGRP; 79 if (entry->ae_perm & ACL_EXECUTE) 80 ret_mode |= S_IXGRP; 81 break; 82 case ACL_OTHER: 83 if (entry->ae_perm & ACL_READ) 84 ret_mode |= S_IROTH; 85 if (entry->ae_perm & ACL_WRITE) 86 ret_mode |= S_IWOTH; 87 if (entry->ae_perm & ACL_EXECUTE) 88 ret_mode |= S_IXOTH; 89 break; 90 default: 91 return (1); 92 } 93 } 94 95 if (mode_p != NULL) 96 *mode_p = ret_mode; 97 98 return (0); 99 } 100