pwupd.c revision 285092 
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 285092 2015-07-03 14:22:44Z bapt $";
30#endif /* not lint */
31
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35#include <unistd.h>
36#include <pwd.h>
37#include <libutil.h>
38#include <errno.h>
39#include <err.h>
40#include <sys/types.h>
41#include <sys/stat.h>
42#include <sys/param.h>
43#include <sys/wait.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		err(1, "pw_copy()");
117	}
118	/*
119	 * in case of deletion of a user, the whole database
120	 * needs to be regenerated
121	 */
122	if (pw_mkdb(pw != NULL ? pw->pw_name : NULL) == -1) {
123		pw_fini();
124		err(1, "pw_mkdb()");
125	}
126	free(pw);
127	pw_fini();
128
129	return (0);
130}
131
132int
133addpwent(struct passwd * pwd)
134{
135
136	return (pw_update(pwd, NULL));
137}
138
139int
140chgpwent(char const * login, struct passwd * pwd)
141{
142
143	return (pw_update(pwd, login));
144}
145
146int
147delpwent(struct passwd * pwd)
148{
149
150	return (pw_update(NULL, pwd->pw_name));
151}
152