1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (c) 2025 The FreeBSD Foundation
7 *
8 * Portions of this software were developed by Olivier Certner
9 * <olce@FreeBSD.org> at Kumacom SARL under sponsorship from the FreeBSD
10 * Foundation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 /* For __sym_compat(). */
38 #include <sys/cdefs.h>
39
40 #include <errno.h>
41 #include <stdlib.h>
42 #include <unistd.h>
43
44 /* For freebsd14_setgroups(). */
45 #include "gen-compat.h"
46
47 static int
initgroups_impl(const char * uname,gid_t agroup,int (* setgroups)(int,const gid_t *))48 initgroups_impl(const char *uname, gid_t agroup,
49 int (*setgroups)(int, const gid_t *))
50 {
51 gid_t *groups;
52 long ngroups_max;
53 int ngroups, ret;
54
55 /*
56 * Provide space for one group more than possible to allow setgroups()
57 * to fail and set 'errno' in case we get back more than {NGROUPS_MAX} +
58 * 1 groups.
59 */
60 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 2;
61 groups = malloc(sizeof(*groups) * ngroups_max);
62 if (groups == NULL)
63 return (-1); /* malloc() set 'errno'. */
64
65 ngroups = (int)ngroups_max;
66 (void)getgrouplist(uname, agroup, groups, &ngroups);
67 ret = (*setgroups)(ngroups, groups);
68
69 free(groups);
70 return (ret); /* setgroups() set 'errno'. */
71 }
72
73 int
initgroups(const char * uname,gid_t agroup)74 initgroups(const char *uname, gid_t agroup)
75 {
76 return (initgroups_impl(uname, agroup, setgroups));
77 }
78
79 int
freebsd14_initgroups(const char * uname,gid_t agroup)80 freebsd14_initgroups(const char *uname, gid_t agroup)
81 {
82 return (initgroups_impl(uname, agroup, freebsd14_setgroups));
83 }
84
85 __sym_compat(initgroups, freebsd14_initgroups, FBSD_1.0);
86