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/types.h> 33 #include <sys/param.h> 34 #include <sys/errno.h> 35 #include <sys/stat.h> 36 #include <sys/acl.h> 37 38 #include "acl_support.h" 39 40 int 41 acl_equiv_mode_np(acl_t acl, mode_t *mode_p) 42 { 43 mode_t ret_mode = 0; 44 45 if (acl == NULL) { 46 errno = EINVAL; 47 return (-1); 48 } 49 50 /* Linux returns 0 for ACL returned by acl_init() */ 51 if (_acl_brand(acl) == ACL_BRAND_UNKNOWN && acl->ats_acl.acl_cnt == 0) 52 goto done; 53 54 // TODO: Do we want to handle ACL_BRAND_NFS4 in this function? */ 55 if (_acl_brand(acl) != ACL_BRAND_POSIX) 56 return (1); 57 58 for (int cur_entry = 0; cur_entry < acl->ats_acl.acl_cnt; cur_entry++) { 59 acl_entry_t entry = &acl->ats_acl.acl_entry[cur_entry]; 60 61 if ((entry->ae_perm & ACL_PERM_BITS) != entry->ae_perm) 62 return (1); 63 64 switch (entry->ae_tag) { 65 case ACL_USER_OBJ: 66 if (entry->ae_perm & ACL_READ) 67 ret_mode |= S_IRUSR; 68 if (entry->ae_perm & ACL_WRITE) 69 ret_mode |= S_IWUSR; 70 if (entry->ae_perm & ACL_EXECUTE) 71 ret_mode |= S_IXUSR; 72 break; 73 case ACL_GROUP_OBJ: 74 if (entry->ae_perm & ACL_READ) 75 ret_mode |= S_IRGRP; 76 if (entry->ae_perm & ACL_WRITE) 77 ret_mode |= S_IWGRP; 78 if (entry->ae_perm & ACL_EXECUTE) 79 ret_mode |= S_IXGRP; 80 break; 81 case ACL_OTHER: 82 if (entry->ae_perm & ACL_READ) 83 ret_mode |= S_IROTH; 84 if (entry->ae_perm & ACL_WRITE) 85 ret_mode |= S_IWOTH; 86 if (entry->ae_perm & ACL_EXECUTE) 87 ret_mode |= S_IXOTH; 88 break; 89 default: 90 return (1); 91 } 92 } 93 94 done: 95 if (mode_p != NULL) 96 *mode_p = ret_mode; 97 98 return (0); 99 } 100