field.c revision 117430 
1/*
2 * Copyright (c) 1988, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 2002 Networks Associates Technology, Inc.
5 * All rights reserved.
6 *
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
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. All advertising materials mentioning features or use of this software
21 *    must display the following acknowledgement:
22 *	This product includes software developed by the University of
23 *	California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41#if 0
42#ifndef lint
43static char sccsid[] = "@(#)field.c	8.4 (Berkeley) 4/2/94";
44#endif /* not lint */
45#endif
46
47#include <sys/cdefs.h>
48__FBSDID("$FreeBSD: head/usr.bin/chpass/field.c 117430 2003-07-11 05:47:05Z kan $");
49
50#include <sys/param.h>
51#include <sys/stat.h>
52
53#include <ctype.h>
54#include <err.h>
55#include <errno.h>
56#include <grp.h>
57#include <paths.h>
58#include <pwd.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64#include "chpass.h"
65
66/* ARGSUSED */
67int
68p_login(char *p, struct passwd *pw, ENTRY *ep __unused)
69{
70	if (!*p) {
71		warnx("empty login field");
72		return (-1);
73	}
74	if (*p == '-') {
75		warnx("login names may not begin with a hyphen");
76		return (-1);
77	}
78	if (!(pw->pw_name = strdup(p))) {
79		warnx("can't save entry");
80		return (-1);
81	}
82	if (strchr(p, '.'))
83		warnx("\'.\' is dangerous in a login name");
84	for (; *p; ++p)
85		if (isupper(*p)) {
86			warnx("upper-case letters are dangerous in a login name");
87			break;
88		}
89	return (0);
90}
91
92/* ARGSUSED */
93int
94p_passwd(char *p, struct passwd *pw, ENTRY *ep __unused)
95{
96	if (!(pw->pw_passwd = strdup(p))) {
97		warnx("can't save password entry");
98		return (-1);
99	}
100
101	return (0);
102}
103
104/* ARGSUSED */
105int
106p_uid(char *p, struct passwd *pw, ENTRY *ep __unused)
107{
108	uid_t id;
109	char *np;
110
111	if (!*p) {
112		warnx("empty uid field");
113		return (-1);
114	}
115	if (!isdigit(*p)) {
116		warnx("illegal uid");
117		return (-1);
118	}
119	errno = 0;
120	id = strtoul(p, &np, 10);
121	if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
122		warnx("illegal uid");
123		return (-1);
124	}
125	pw->pw_uid = id;
126	return (0);
127}
128
129/* ARGSUSED */
130int
131p_gid(char *p, struct passwd *pw, ENTRY *ep __unused)
132{
133	struct group *gr;
134	gid_t id;
135	char *np;
136
137	if (!*p) {
138		warnx("empty gid field");
139		return (-1);
140	}
141	if (!isdigit(*p)) {
142		if (!(gr = getgrnam(p))) {
143			warnx("unknown group %s", p);
144			return (-1);
145		}
146		pw->pw_gid = gr->gr_gid;
147		return (0);
148	}
149	errno = 0;
150	id = strtoul(p, &np, 10);
151	if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
152		warnx("illegal gid");
153		return (-1);
154	}
155	pw->pw_gid = id;
156	return (0);
157}
158
159/* ARGSUSED */
160int
161p_class(char *p, struct passwd *pw, ENTRY *ep __unused)
162{
163	if (!(pw->pw_class = strdup(p))) {
164		warnx("can't save entry");
165		return (-1);
166	}
167
168	return (0);
169}
170
171/* ARGSUSED */
172int
173p_change(char *p, struct passwd *pw, ENTRY *ep __unused)
174{
175	if (!atot(p, &pw->pw_change))
176		return (0);
177	warnx("illegal date for change field");
178	return (-1);
179}
180
181/* ARGSUSED */
182int
183p_expire(char *p, struct passwd *pw, ENTRY *ep __unused)
184{
185	if (!atot(p, &pw->pw_expire))
186		return (0);
187	warnx("illegal date for expire field");
188	return (-1);
189}
190
191/* ARGSUSED */
192int
193p_gecos(char *p, struct passwd *pw __unused, ENTRY *ep)
194{
195	if (!(ep->save = strdup(p))) {
196		warnx("can't save entry");
197		return (-1);
198	}
199	return (0);
200}
201
202/* ARGSUSED */
203int
204p_hdir(char *p, struct passwd *pw, ENTRY *ep __unused)
205{
206	if (!*p) {
207		warnx("empty home directory field");
208		return (-1);
209	}
210	if (!(pw->pw_dir = strdup(p))) {
211		warnx("can't save entry");
212		return (-1);
213	}
214	return (0);
215}
216
217/* ARGSUSED */
218int
219p_shell(char *p, struct passwd *pw, ENTRY *ep __unused)
220{
221	char *t;
222	struct stat sbuf;
223
224	if (!*p) {
225		pw->pw_shell = strdup(_PATH_BSHELL);
226		return (0);
227	}
228	/* only admin can change from or to "restricted" shells */
229	if (!master_mode && pw->pw_shell && !ok_shell(pw->pw_shell)) {
230		warnx("%s: current shell non-standard", pw->pw_shell);
231		return (-1);
232	}
233	if (!(t = ok_shell(p))) {
234		if (!master_mode) {
235			warnx("%s: non-standard shell", p);
236			return (-1);
237		}
238	}
239	else
240		p = t;
241	if (!(pw->pw_shell = strdup(p))) {
242		warnx("can't save entry");
243		return (-1);
244	}
245	if (stat(pw->pw_shell, &sbuf) < 0) {
246		if (errno == ENOENT)
247			warnx("WARNING: shell '%s' does not exist",
248			    pw->pw_shell);
249		else
250			warn("WARNING: can't stat shell '%s'",  pw->pw_shell);
251		return (0);
252	}
253	if (!S_ISREG(sbuf.st_mode)) {
254		warnx("WARNING: shell '%s' is not a regular file",
255			pw->pw_shell);
256		return (0);
257	}
258	if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) {
259		warnx("WARNING: shell '%s' is not executable", pw->pw_shell);
260		return (0);
261	}
262	return (0);
263}
264