1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999-2001, 2008 Robert N. M. Watson 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 * Support functionality for the POSIX.1e ACL interface 30 * These calls are intended only to be called within the library. 31 */ 32 33 #include <sys/cdefs.h> 34 #if 0 35 __FBSDID("$FreeBSD: head/lib/libc/posix1e/acl_id_to_name.c 326193 2017-11-25 17:12:48Z pfg $"); 36 #else 37 __RCSID("$NetBSD: acl_id_to_name.c,v 1.1 2020/05/16 18:31:47 christos Exp $"); 38 #endif 39 40 #include "namespace.h" 41 #include <sys/types.h> 42 #include <sys/acl.h> 43 #include <errno.h> 44 #include <grp.h> 45 #include <pwd.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <assert.h> 50 51 #include "acl_support.h" 52 53 /* 54 * Given a uid/gid, return a username/groupname for the text form of an ACL. 55 * Note that we truncate user and group names, rather than error out, as 56 * this is consistent with other tools manipulating user and group names. 57 * XXX NOT THREAD SAFE, RELIES ON GETPWUID, GETGRGID 58 * XXX USES *PW* AND *GR* WHICH ARE STATEFUL AND THEREFORE THIS ROUTINE 59 * MAY HAVE SIDE-EFFECTS 60 */ 61 int 62 _posix1e_acl_id_to_name(acl_tag_t tag, uid_t id, ssize_t buf_len, char *buf, 63 int flags) 64 { 65 struct group *g; 66 struct passwd *p; 67 int i; 68 69 switch(tag) { 70 case ACL_USER: 71 if (flags & ACL_TEXT_NUMERIC_IDS) 72 p = NULL; 73 else 74 p = getpwuid(id); 75 if (!p) 76 i = snprintf(buf, buf_len, "%d", id); 77 else 78 i = snprintf(buf, buf_len, "%s", p->pw_name); 79 80 if (i < 0) { 81 errno = ENOMEM; 82 return (-1); 83 } 84 return (0); 85 86 case ACL_GROUP: 87 if (flags & ACL_TEXT_NUMERIC_IDS) 88 g = NULL; 89 else 90 g = getgrgid(id); 91 if (g == NULL) 92 i = snprintf(buf, buf_len, "%d", id); 93 else 94 i = snprintf(buf, buf_len, "%s", g->gr_name); 95 96 if (i < 0) { 97 errno = ENOMEM; 98 return (-1); 99 } 100 return (0); 101 102 default: 103 return (EINVAL); 104 } 105 } 106