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. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)field.c 8.4 (Berkeley) 4/2/94
37 * $FreeBSD: src/usr.bin/chpass/field.c,v 1.9 2004/01/18 21:46:39 charnier Exp $
38 * $DragonFly: src/usr.bin/chpass/field.c,v 1.3 2003/10/02 17:42:26 hmp Exp $
39 */
40
41 #include <sys/param.h>
42 #include <sys/stat.h>
43
44 #include <ctype.h>
45 #include <err.h>
46 #include <errno.h>
47 #include <grp.h>
48 #include <paths.h>
49 #include <pwd.h>
50 #include <stdlib.h>
51 #include <string.h>
52
53 #include "chpass.h"
54
55 /* ARGSUSED */
56 int
p_login(char * p,struct passwd * pw,ENTRY * ep __unused)57 p_login(char *p, struct passwd *pw, ENTRY *ep __unused)
58 {
59 if (!*p) {
60 warnx("empty login field");
61 return (-1);
62 }
63 if (*p == '-') {
64 warnx("login names may not begin with a hyphen");
65 return (-1);
66 }
67 if (!(pw->pw_name = strdup(p))) {
68 warnx("can't save entry");
69 return (-1);
70 }
71 if (strchr(p, '.'))
72 warnx("\'.\' is dangerous in a login name");
73 for (; *p; ++p)
74 if (isupper(*p)) {
75 warnx("upper-case letters are dangerous in a login name");
76 break;
77 }
78 return (0);
79 }
80
81 /* ARGSUSED */
82 int
p_passwd(char * p,struct passwd * pw,ENTRY * ep __unused)83 p_passwd(char *p, struct passwd *pw, ENTRY *ep __unused)
84 {
85 if (!(pw->pw_passwd = strdup(p))) {
86 warnx("can't save password entry");
87 return (-1);
88 }
89
90 return (0);
91 }
92
93 /* ARGSUSED */
94 int
p_uid(char * p,struct passwd * pw,ENTRY * ep __unused)95 p_uid(char *p, struct passwd *pw, ENTRY *ep __unused)
96 {
97 uid_t id;
98 char *np;
99
100 if (!*p) {
101 warnx("empty uid field");
102 return (-1);
103 }
104 if (!isdigit(*p)) {
105 warnx("illegal uid");
106 return (-1);
107 }
108 errno = 0;
109 id = strtoul(p, &np, 10);
110 if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
111 warnx("illegal uid");
112 return (-1);
113 }
114 pw->pw_uid = id;
115 return (0);
116 }
117
118 /* ARGSUSED */
119 int
p_gid(char * p,struct passwd * pw,ENTRY * ep __unused)120 p_gid(char *p, struct passwd *pw, ENTRY *ep __unused)
121 {
122 struct group *gr;
123 gid_t id;
124 char *np;
125
126 if (!*p) {
127 warnx("empty gid field");
128 return (-1);
129 }
130 if (!isdigit(*p)) {
131 if (!(gr = getgrnam(p))) {
132 warnx("unknown group %s", p);
133 return (-1);
134 }
135 pw->pw_gid = gr->gr_gid;
136 return (0);
137 }
138 errno = 0;
139 id = strtoul(p, &np, 10);
140 if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
141 warnx("illegal gid");
142 return (-1);
143 }
144 pw->pw_gid = id;
145 return (0);
146 }
147
148 /* ARGSUSED */
149 int
p_class(char * p,struct passwd * pw,ENTRY * ep __unused)150 p_class(char *p, struct passwd *pw, ENTRY *ep __unused)
151 {
152 if (!(pw->pw_class = strdup(p))) {
153 warnx("can't save entry");
154 return (-1);
155 }
156
157 return (0);
158 }
159
160 /* ARGSUSED */
161 int
p_change(char * p,struct passwd * pw,ENTRY * ep __unused)162 p_change(char *p, struct passwd *pw, ENTRY *ep __unused)
163 {
164 if (!atot(p, &pw->pw_change))
165 return (0);
166 warnx("illegal date for change field");
167 return (-1);
168 }
169
170 /* ARGSUSED */
171 int
p_expire(char * p,struct passwd * pw,ENTRY * ep __unused)172 p_expire(char *p, struct passwd *pw, ENTRY *ep __unused)
173 {
174 if (!atot(p, &pw->pw_expire))
175 return (0);
176 warnx("illegal date for expire field");
177 return (-1);
178 }
179
180 /* ARGSUSED */
181 int
p_gecos(char * p,struct passwd * pw __unused,ENTRY * ep)182 p_gecos(char *p, struct passwd *pw __unused, ENTRY *ep)
183 {
184 if (!(ep->save = strdup(p))) {
185 warnx("can't save entry");
186 return (-1);
187 }
188 return (0);
189 }
190
191 /* ARGSUSED */
192 int
p_hdir(char * p,struct passwd * pw,ENTRY * ep __unused)193 p_hdir(char *p, struct passwd *pw, ENTRY *ep __unused)
194 {
195 if (!*p) {
196 warnx("empty home directory field");
197 return (-1);
198 }
199 if (!(pw->pw_dir = strdup(p))) {
200 warnx("can't save entry");
201 return (-1);
202 }
203 return (0);
204 }
205
206 /* ARGSUSED */
207 int
p_shell(char * p,struct passwd * pw,ENTRY * ep __unused)208 p_shell(char *p, struct passwd *pw, ENTRY *ep __unused)
209 {
210 struct stat sbuf;
211
212 if (!*p) {
213 pw->pw_shell = strdup(_PATH_BSHELL);
214 return (0);
215 }
216 /* only admin can change from or to "restricted" shells */
217 if (!master_mode && pw->pw_shell && !ok_shell(pw->pw_shell)) {
218 warnx("%s: current shell non-standard", pw->pw_shell);
219 return (-1);
220 }
221 if (!ok_shell(p)) {
222 if (!master_mode) {
223 warnx("%s: non-standard shell", p);
224 return (-1);
225 }
226 pw->pw_shell = strdup(p);
227 }
228 else
229 pw->pw_shell = dup_shell(p);
230 if (!pw->pw_shell) {
231 warnx("can't save entry");
232 return (-1);
233 }
234 if (stat(pw->pw_shell, &sbuf) < 0) {
235 if (errno == ENOENT)
236 warnx("WARNING: shell '%s' does not exist",
237 pw->pw_shell);
238 else
239 warn("WARNING: can't stat shell '%s'", pw->pw_shell);
240 return (0);
241 }
242 if (!S_ISREG(sbuf.st_mode)) {
243 warnx("WARNING: shell '%s' is not a regular file",
244 pw->pw_shell);
245 return (0);
246 }
247 if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) {
248 warnx("WARNING: shell '%s' is not executable", pw->pw_shell);
249 return (0);
250 }
251 return (0);
252 }
253