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 __FBSDID("$FreeBSD$"); 35 36 #include <sys/types.h> 37 #include "namespace.h" 38 #include <sys/acl.h> 39 #include "un-namespace.h" 40 #include <errno.h> 41 #include <grp.h> 42 #include <pwd.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <assert.h> 47 48 #include "acl_support.h" 49 50 /* 51 * Given a uid/gid, return a username/groupname for the text form of an ACL. 52 * Note that we truncate user and group names, rather than error out, as 53 * this is consistent with other tools manipulating user and group names. 54 * XXX NOT THREAD SAFE, RELIES ON GETPWUID, GETGRGID 55 * XXX USES *PW* AND *GR* WHICH ARE STATEFUL AND THEREFORE THIS ROUTINE 56 * MAY HAVE SIDE-EFFECTS 57 */ 58 int 59 _posix1e_acl_id_to_name(acl_tag_t tag, uid_t id, ssize_t buf_len, char *buf, 60 int flags) 61 { 62 struct group *g; 63 struct passwd *p; 64 int i; 65 66 switch(tag) { 67 case ACL_USER: 68 if (flags & ACL_TEXT_NUMERIC_IDS) 69 p = NULL; 70 else 71 p = getpwuid(id); 72 if (!p) 73 i = snprintf(buf, buf_len, "%d", id); 74 else 75 i = snprintf(buf, buf_len, "%s", p->pw_name); 76 77 if (i < 0) { 78 errno = ENOMEM; 79 return (-1); 80 } 81 return (0); 82 83 case ACL_GROUP: 84 if (flags & ACL_TEXT_NUMERIC_IDS) 85 g = NULL; 86 else 87 g = getgrgid(id); 88 if (g == NULL) 89 i = snprintf(buf, buf_len, "%d", id); 90 else 91 i = snprintf(buf, buf_len, "%s", g->gr_name); 92 93 if (i < 0) { 94 errno = ENOMEM; 95 return (-1); 96 } 97 return (0); 98 99 default: 100 return (EINVAL); 101 } 102 } 103