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("$FreeBSD$");
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 <stdlib.h>
60#include <string.h>
61
62#include "chpass.h"
63
64/* ARGSUSED */
65int
66p_login(char *p, struct passwd *pw, ENTRY *ep __unused)
67{
68	if (!*p) {
69		warnx("empty login field");
70		return (-1);
71	}
72	if (*p == '-') {
73		warnx("login names may not begin with a hyphen");
74		return (-1);
75	}
76	if (!(pw->pw_name = strdup(p))) {
77		warnx("can't save entry");
78		return (-1);
79	}
80	if (strchr(p, '.'))
81		warnx("\'.\' is dangerous in a login name");
82	for (; *p; ++p)
83		if (isupper(*p)) {
84			warnx("upper-case letters are dangerous in a login name");
85			break;
86		}
87	return (0);
88}
89
90/* ARGSUSED */
91int
92p_passwd(char *p, struct passwd *pw, ENTRY *ep __unused)
93{
94	if (!(pw->pw_passwd = strdup(p))) {
95		warnx("can't save password entry");
96		return (-1);
97	}
98
99	return (0);
100}
101
102/* ARGSUSED */
103int
104p_uid(char *p, struct passwd *pw, ENTRY *ep __unused)
105{
106	uid_t id;
107	char *np;
108
109	if (!*p) {
110		warnx("empty uid field");
111		return (-1);
112	}
113	if (!isdigit(*p)) {
114		warnx("illegal uid");
115		return (-1);
116	}
117	errno = 0;
118	id = strtoul(p, &np, 10);
119	if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
120		warnx("illegal uid");
121		return (-1);
122	}
123	pw->pw_uid = id;
124	return (0);
125}
126
127/* ARGSUSED */
128int
129p_gid(char *p, struct passwd *pw, ENTRY *ep __unused)
130{
131	struct group *gr;
132	gid_t id;
133	char *np;
134
135	if (!*p) {
136		warnx("empty gid field");
137		return (-1);
138	}
139	if (!isdigit(*p)) {
140		if (!(gr = getgrnam(p))) {
141			warnx("unknown group %s", p);
142			return (-1);
143		}
144		pw->pw_gid = gr->gr_gid;
145		return (0);
146	}
147	errno = 0;
148	id = strtoul(p, &np, 10);
149	if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
150		warnx("illegal gid");
151		return (-1);
152	}
153	pw->pw_gid = id;
154	return (0);
155}
156
157/* ARGSUSED */
158int
159p_class(char *p, struct passwd *pw, ENTRY *ep __unused)
160{
161	if (!(pw->pw_class = strdup(p))) {
162		warnx("can't save entry");
163		return (-1);
164	}
165
166	return (0);
167}
168
169/* ARGSUSED */
170int
171p_change(char *p, struct passwd *pw, ENTRY *ep __unused)
172{
173	if (!atot(p, &pw->pw_change))
174		return (0);
175	warnx("illegal date for change field");
176	return (-1);
177}
178
179/* ARGSUSED */
180int
181p_expire(char *p, struct passwd *pw, ENTRY *ep __unused)
182{
183	if (!atot(p, &pw->pw_expire))
184		return (0);
185	warnx("illegal date for expire field");
186	return (-1);
187}
188
189/* ARGSUSED */
190int
191p_gecos(char *p, struct passwd *pw __unused, ENTRY *ep)
192{
193	if (!(ep->save = strdup(p))) {
194		warnx("can't save entry");
195		return (-1);
196	}
197	return (0);
198}
199
200/* ARGSUSED */
201int
202p_hdir(char *p, struct passwd *pw, ENTRY *ep __unused)
203{
204	if (!*p) {
205		warnx("empty home directory field");
206		return (-1);
207	}
208	if (!(pw->pw_dir = strdup(p))) {
209		warnx("can't save entry");
210		return (-1);
211	}
212	return (0);
213}
214
215/* ARGSUSED */
216int
217p_shell(char *p, struct passwd *pw, ENTRY *ep __unused)
218{
219	struct stat sbuf;
220
221	if (!*p) {
222		pw->pw_shell = strdup(_PATH_BSHELL);
223		return (0);
224	}
225	/* only admin can change from or to "restricted" shells */
226	if (!master_mode && pw->pw_shell && !ok_shell(pw->pw_shell)) {
227		warnx("%s: current shell non-standard", pw->pw_shell);
228		return (-1);
229	}
230	if (!ok_shell(p)) {
231		if (!master_mode) {
232			warnx("%s: non-standard shell", p);
233			return (-1);
234		}
235		pw->pw_shell = strdup(p);
236	}
237	else
238		pw->pw_shell = dup_shell(p);
239	if (!pw->pw_shell) {
240		warnx("can't save entry");
241		return (-1);
242	}
243	if (stat(pw->pw_shell, &sbuf) < 0) {
244		if (errno == ENOENT)
245			warnx("WARNING: shell '%s' does not exist",
246			    pw->pw_shell);
247		else
248			warn("WARNING: can't stat shell '%s'",  pw->pw_shell);
249		return (0);
250	}
251	if (!S_ISREG(sbuf.st_mode)) {
252		warnx("WARNING: shell '%s' is not a regular file",
253			pw->pw_shell);
254		return (0);
255	}
256	if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) {
257		warnx("WARNING: shell '%s' is not executable", pw->pw_shell);
258		return (0);
259	}
260	return (0);
261}
262