1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/* $OpenBSD: local_passwd.c,v 1.22 2001/11/19 19:02:15 mpech Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
/*static const char sccsid[] = "from: @(#)local_passwd.c 5.5 (Berkeley) 5/6/91";*/
static const char rcsid[] = "$OpenBSD: local_passwd.c,v 1.22 2001/11/19 19:02:15 mpech Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include <login_cap.h>
static uid_t uid;
extern int pwd_gensalt __P((char *, int, struct passwd *, login_cap_t *, char));
extern int pwd_check __P((struct passwd *, login_cap_t *, char *));
extern int pwd_gettries __P((struct passwd *, login_cap_t *));
char *getnewpasswd __P((struct passwd *, login_cap_t *, int));
void kbintr __P((int));
int
local_passwd(uname, authenticated)
char *uname;
int authenticated;
{
struct passwd *pw;
login_cap_t *lc;
sigset_t fullset;
time_t period;
int i, pfd, tfd = -1;
int pwflags = _PASSWORD_OMITV7;
if (!(pw = getpwnam(uname))) {
#ifdef YP
extern int use_yp;
if (!use_yp)
#endif
warnx("unknown user %s.", uname);
return(1);
}
if ((lc = login_getclass(pw->pw_class)) == NULL) {
warnx("unable to get login class for user %s.", uname);
return(1);
}
uid = authenticated ? pw->pw_uid : getuid();
if (uid && uid != pw->pw_uid) {
warnx("login/uid mismatch, username argument required.");
return(1);
}
/* Get the new password. */
pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
/* Reset password change time based on login.conf. */
period = login_getcaptime(lc, "passwordtime", 0, 0);
if (period > 0) {
pw->pw_change = time(NULL) + period;
} else {
/*
* If the pw change time is the same we only need
* to update the spwd.db file.
*/
if (pw->pw_change != 0)
pw->pw_change = 0;
else
pwflags = _PASSWORD_SECUREONLY;
}
/* Drop user's real uid and block all signals to avoid a DoS. */
setuid(0);
sigfillset(&fullset);
sigdelset(&fullset, SIGINT);
sigprocmask(SIG_BLOCK, &fullset, NULL);
/* Get a lock on the passwd file and open it. */
pw_init();
for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
if (i == 4)
(void)fputs("Attempting lock password file, "
"please wait or press ^C to abort", stderr);
(void)signal(SIGINT, kbintr);
if (i % 16 == 0)
fputc('.', stderr);
usleep(250000);
(void)signal(SIGINT, SIG_IGN);
}
if (i >= 4)
fputc('\n', stderr);
pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
if (pfd < 0 || fcntl(pfd, F_SETFD, 1) == -1)
pw_error(_PATH_MASTERPASSWD, 1, 1);
/* Update master.passwd file and rebuild spwd.db. */
pw_copy(pfd, tfd, pw);
if (pw_mkdb(uname, pwflags) < 0)
pw_error(NULL, 0, 1);
return(0);
}
char *
getnewpasswd(pw, lc, authenticated)
struct passwd *pw;
login_cap_t *lc;
int authenticated;
{
char *p;
int tries, pwd_tries;
char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN];
if (!authenticated) {
(void)printf("Changing local password for %s.\n", pw->pw_name);
if (uid && pw->pw_passwd[0] &&
strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
pw->pw_passwd)) {
errno = EACCES;
pw_error(NULL, 1, 1);
}
}
pwd_tries = pwd_gettries(pw, lc);
for (buf[0] = '\0', tries = 0;;) {
p = getpass("New password:");
if (!*p) {
(void)printf("Password unchanged.\n");
pw_error(NULL, 0, 0);
}
if (strcmp(p, "s/key") == 0) {
printf("That password collides with a system feature. Choose another.\n");
continue;
}
if ((tries++ < pwd_tries || pwd_tries == 0)
&& pwd_check(pw, lc, p) == 0)
continue;
strlcpy(buf, p, sizeof(buf));
if (!strcmp(buf, getpass("Retype new password:")))
break;
(void)printf("Mismatch; try again, EOF to quit.\n");
}
if (!pwd_gensalt(salt, _PASSWORD_LEN, pw, lc, 'l')) {
(void)printf("Couldn't generate salt.\n");
pw_error(NULL, 0, 0);
}
return(crypt(buf, salt));
}
void
kbintr(signo)
int signo;
{
char msg[] = "\nPassword unchanged.\n";
struct iovec iv[5];
extern char *__progname;
iv[0].iov_base = "\nPassword unchanged.\n";
iv[0].iov_len = sizeof(msg) - 1;
iv[1].iov_base = __progname;
iv[1].iov_len = strlen(__progname);
iv[2].iov_base = ": ";
iv[2].iov_len = 2;
iv[3].iov_base = _PATH_MASTERPASSWD;
iv[3].iov_len = sizeof(_PATH_MASTERPASSWD) - 1;
iv[4].iov_base = " unchanged\n";
iv[4].iov_len = 11;
writev(STDERR_FILENO, iv, 5);
_exit(1);
}
|
