pwupd.c revision 256281 
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 244711 2012-12-26 18:28:17Z bapt $";
30#endif /* not lint */
31
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35#include <unistd.h>
36#include <stdarg.h>
37#include <pwd.h>
38#include <libutil.h>
39#include <errno.h>
40#include <err.h>
41#include <sys/types.h>
42#include <sys/stat.h>
43#include <sys/param.h>
44#include <sys/wait.h>
45
46#include "pwupd.h"
47
48#define HAVE_PWDB_C	1
49#define	HAVE_PWDB_U	1
50
51static char pathpwd[] = _PATH_PWD;
52static char * pwpath = pathpwd;
53
54int
55setpwdir(const char * dir)
56{
57	if (dir == NULL)
58		return -1;
59	else
60		pwpath = strdup(dir);
61	if (pwpath == NULL)
62		return -1;
63	return 0;
64}
65
66char *
67getpwpath(char const * file)
68{
69	static char pathbuf[MAXPATHLEN];
70
71	snprintf(pathbuf, sizeof pathbuf, "%s/%s", pwpath, file);
72	return pathbuf;
73}
74
75static int
76pwdb(char *arg,...)
77{
78	int             i = 0;
79	pid_t           pid;
80	va_list         ap;
81	char           *args[10];
82
83	args[i++] = _PATH_PWD_MKDB;
84	va_start(ap, arg);
85	while (i < 6 && arg != NULL) {
86		args[i++] = arg;
87		arg = va_arg(ap, char *);
88	}
89	if (pwpath != pathpwd) {
90		args[i++] = "-d";
91		args[i++] = pwpath;
92	}
93	args[i++] = getpwpath(_MASTERPASSWD);
94	args[i] = NULL;
95
96	if ((pid = fork()) == -1)	/* Error (errno set) */
97		i = errno;
98	else if (pid == 0) {	/* Child */
99		execv(args[0], args);
100		_exit(1);
101	} else {		/* Parent */
102		waitpid(pid, &i, 0);
103		if (WEXITSTATUS(i))
104			i = EIO;
105	}
106	va_end(ap);
107	return i;
108}
109
110static int
111pw_update(struct passwd * pwd, char const * user)
112{
113	int             rc = 0;
114
115	/*
116	 * First, let's check the see if the database is alright
117	 * Note: -C is only available in FreeBSD 2.2 and above
118	 */
119#ifdef HAVE_PWDB_C
120	rc = pwdb("-C", (char *)NULL);	/* Check only */
121	if (rc == 0) {
122#else
123	{				/* No -C */
124#endif
125		int pfd, tfd;
126		struct passwd *pw = NULL;
127		struct passwd *old_pw = NULL;
128
129	       	if (pwd != NULL)
130		       pw = pw_dup(pwd);
131
132		if (user != NULL)
133			old_pw = GETPWNAM(user);
134
135		if (pw_init(pwpath, NULL))
136			err(1, "pw_init()");
137		if ((pfd = pw_lock()) == -1) {
138			pw_fini();
139			err(1, "pw_lock()");
140		}
141		if ((tfd = pw_tmp(-1)) == -1) {
142			pw_fini();
143			err(1, "pw_tmp()");
144		}
145		if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
146			pw_fini();
147			err(1, "pw_copy()");
148		}
149		/*
150		 * in case of deletion of a user, the whole database
151		 * needs to be regenerated
152		 */
153		if (pw_mkdb(pw != NULL ? user : NULL) == -1) {
154			pw_fini();
155			err(1, "pw_mkdb()");
156		}
157		free(pw);
158		pw_fini();
159	}
160	return 0;
161}
162
163int
164addpwent(struct passwd * pwd)
165{
166	return pw_update(pwd, NULL);
167}
168
169int
170chgpwent(char const * login, struct passwd * pwd)
171{
172	return pw_update(pwd, login);
173}
174
175int
176delpwent(struct passwd * pwd)
177{
178	char login[MAXLOGNAME];
179
180	strlcpy(login, pwd->pw_name, MAXLOGNAME);
181	return pw_update(NULL, login);
182}
183