pwupd.c revision 330449 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 1996
5 *	David L. Nugent.  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 DAVID L. NUGENT 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 DAVID L. NUGENT 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#ifndef lint
30static const char rcsid[] =
31  "$FreeBSD: stable/11/usr.sbin/pw/pwupd.c 330449 2018-03-05 07:26:05Z eadler $";
32#endif /* not lint */
33
34#include <sys/wait.h>
35
36#include <err.h>
37#include <errno.h>
38#include <pwd.h>
39#include <libutil.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <unistd.h>
44
45#include "pwupd.h"
46
47char *
48getpwpath(char const * file)
49{
50	static char pathbuf[MAXPATHLEN];
51
52	snprintf(pathbuf, sizeof pathbuf, "%s/%s", conf.etcpath, file);
53
54	return (pathbuf);
55}
56
57static int
58pwdb_check(void)
59{
60	int             i = 0;
61	pid_t           pid;
62	char           *args[10];
63
64	args[i++] = _PATH_PWD_MKDB;
65	args[i++] = "-C";
66
67	if (strcmp(conf.etcpath, _PATH_PWD) != 0) {
68		args[i++] = "-d";
69		args[i++] = conf.etcpath;
70	}
71	args[i++] = getpwpath(_MASTERPASSWD);
72	args[i] = NULL;
73
74	if ((pid = fork()) == -1)	/* Error (errno set) */
75		i = errno;
76	else if (pid == 0) {	/* Child */
77		execv(args[0], args);
78		_exit(1);
79	} else {		/* Parent */
80		waitpid(pid, &i, 0);
81		if (WEXITSTATUS(i))
82			i = EIO;
83	}
84
85	return (i);
86}
87
88static int
89pw_update(struct passwd * pwd, char const * user)
90{
91	struct passwd	*pw = NULL;
92	struct passwd	*old_pw = NULL;
93	int		 rc, pfd, tfd;
94
95	if ((rc = pwdb_check()) != 0)
96		return (rc);
97
98	if (pwd != NULL)
99		pw = pw_dup(pwd);
100
101	if (user != NULL)
102		old_pw = GETPWNAM(user);
103
104	if (pw_init(conf.etcpath, NULL))
105		err(1, "pw_init()");
106	if ((pfd = pw_lock()) == -1) {
107		pw_fini();
108		err(1, "pw_lock()");
109	}
110	if ((tfd = pw_tmp(-1)) == -1) {
111		pw_fini();
112		err(1, "pw_tmp()");
113	}
114	if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
115		pw_fini();
116		close(tfd);
117		err(1, "pw_copy()");
118	}
119	fsync(tfd);
120	close(tfd);
121	/*
122	 * in case of deletion of a user, the whole database
123	 * needs to be regenerated
124	 */
125	if (pw_mkdb(pw != NULL ? pw->pw_name : NULL) == -1) {
126		pw_fini();
127		err(1, "pw_mkdb()");
128	}
129	free(pw);
130	pw_fini();
131
132	return (0);
133}
134
135int
136addpwent(struct passwd * pwd)
137{
138
139	return (pw_update(pwd, NULL));
140}
141
142int
143chgpwent(char const * login, struct passwd * pwd)
144{
145
146	return (pw_update(pwd, login));
147}
148
149int
150delpwent(struct passwd * pwd)
151{
152
153	return (pw_update(NULL, pwd->pw_name));
154}
155