pwupd.c revision 310173 
1/*-
2 * Copyright (C) 1996
3 *	David L. Nugent.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#ifndef lint
28static const char rcsid[] =
29  "$FreeBSD: stable/10/usr.sbin/pw/pwupd.c 310173 2016-12-16 20:10:55Z asomers $";
30#endif /* not lint */
31
32#include <sys/wait.h>
33
34#include <err.h>
35#include <errno.h>
36#include <pwd.h>
37#include <libutil.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <unistd.h>
42
43#include "pwupd.h"
44
45char *
46getpwpath(char const * file)
47{
48	static char pathbuf[MAXPATHLEN];
49
50	snprintf(pathbuf, sizeof pathbuf, "%s/%s", conf.etcpath, file);
51
52	return (pathbuf);
53}
54
55static int
56pwdb_check(void)
57{
58	int             i = 0;
59	pid_t           pid;
60	char           *args[10];
61
62	args[i++] = _PATH_PWD_MKDB;
63	args[i++] = "-C";
64
65	if (strcmp(conf.etcpath, _PATH_PWD) != 0) {
66		args[i++] = "-d";
67		args[i++] = conf.etcpath;
68	}
69	args[i++] = getpwpath(_MASTERPASSWD);
70	args[i] = NULL;
71
72	if ((pid = fork()) == -1)	/* Error (errno set) */
73		i = errno;
74	else if (pid == 0) {	/* Child */
75		execv(args[0], args);
76		_exit(1);
77	} else {		/* Parent */
78		waitpid(pid, &i, 0);
79		if (WEXITSTATUS(i))
80			i = EIO;
81	}
82
83	return (i);
84}
85
86static int
87pw_update(struct passwd * pwd, char const * user)
88{
89	struct passwd	*pw = NULL;
90	struct passwd	*old_pw = NULL;
91	int		 rc, pfd, tfd;
92
93	if ((rc = pwdb_check()) != 0)
94		return (rc);
95
96	if (pwd != NULL)
97		pw = pw_dup(pwd);
98
99	if (user != NULL)
100		old_pw = GETPWNAM(user);
101
102	if (pw_init(conf.etcpath, NULL))
103		err(1, "pw_init()");
104	if ((pfd = pw_lock()) == -1) {
105		pw_fini();
106		err(1, "pw_lock()");
107	}
108	if ((tfd = pw_tmp(-1)) == -1) {
109		pw_fini();
110		err(1, "pw_tmp()");
111	}
112	if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
113		pw_fini();
114		close(tfd);
115		err(1, "pw_copy()");
116	}
117	fsync(tfd);
118	close(tfd);
119	/*
120	 * in case of deletion of a user, the whole database
121	 * needs to be regenerated
122	 */
123	if (pw_mkdb(pw != NULL ? pw->pw_name : NULL) == -1) {
124		pw_fini();
125		err(1, "pw_mkdb()");
126	}
127	free(pw);
128	pw_fini();
129
130	return (0);
131}
132
133int
134addpwent(struct passwd * pwd)
135{
136
137	return (pw_update(pwd, NULL));
138}
139
140int
141chgpwent(char const * login, struct passwd * pwd)
142{
143
144	return (pw_update(pwd, login));
145}
146
147int
148delpwent(struct passwd * pwd)
149{
150
151	return (pw_update(NULL, pwd->pw_name));
152}
153