NetBSD/usr.bin/passwd/local_passwd.c

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/* $NetBSD: local_passwd.c,v 1.14 1997/10/19 12:29:51 lukem Exp $ */
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/*-
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* Copyright (c) 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
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*
* 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.
*/
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#include <sys/cdefs.h>
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#ifndef lint
#if 0
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static char sccsid[] = "from: @(#)local_passwd.c 8.3 (Berkeley) 4/2/94";
#else
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__RCSID("$NetBSD: local_passwd.c,v 1.14 1997/10/19 12:29:51 lukem Exp $");
#endif
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#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
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#include <ctype.h>
#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
#include <unistd.h>
#include <util.h>
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#include "extern.h"
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static char *getnewpasswd __P((struct passwd *));
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static uid_t uid;
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char *tempname;
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static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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void
to64(s, v, n)
char *s;
long v;
int n;
{
while (--n >= 0) {
*s++ = itoa64[v&0x3f];
v >>= 6;
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}
}
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static char *
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getnewpasswd(pw)
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struct passwd *pw;
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{
int tries;
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char *p, *t;
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char buf[_PASSWORD_LEN+1], salt[9];
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(void)printf("Changing local password for %s.\n", pw->pw_name);
if (uid && pw->pw_passwd[0] &&
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strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
pw->pw_passwd)) {
errno = EACCES;
pw_error(NULL, 1, 1);
}
for (buf[0] = '\0', tries = 0;;) {
p = getpass("New password:");
if (!*p) {
(void)printf("Password unchanged.\n");
pw_error(NULL, 0, 0);
}
if (strlen(p) <= 5 && ++tries < 2) {
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(void)printf("Please enter a longer password.\n");
continue;
}
for (t = p; *t && islower(*t); ++t);
if (!*t && ++tries < 2) {
(void)printf("Please don't use an all-lower case "
"password.\nUnusual capitalization, "
"control characters or digits are "
"suggested.\n");
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continue;
}
(void)strncpy(buf, p, sizeof(buf) - 1);
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if (!strcmp(buf, getpass("Retype new password:")))
break;
(void)printf("Mismatch; try again, EOF to quit.\n");
}
/* grab a random printable character that isn't a colon */
(void)srandom((int)time((time_t *)NULL));
#ifdef NEWSALT
salt[0] = _PASSWORD_EFMT1;
to64(&salt[1], (long)(29 * 25), 4);
to64(&salt[5], random(), 4);
#else
to64(&salt[0], random(), 2);
#endif
return(crypt(buf, salt));
}
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int
local_passwd(uname)
char *uname;
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{
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struct passwd *pw;
struct passwd old_pw;
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int pfd, tfd;
if (!(pw = getpwnam(uname))) {
warnx("unknown user %s", uname);
return (1);
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}
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uid = getuid();
if (uid && uid != pw->pw_uid) {
warnx("%s", strerror(EACCES));
return (1);
}
/* Save the old pw information for comparing on pw_copy(). */
old_pw = *pw;
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/*
* Get the new password. Reset passwd change time to zero; when
* classes are implemented, go and get the "offset" value for this
* class and reset the timer.
*/
pw->pw_passwd = getnewpasswd(pw);
pw->pw_change = 0;
/* Now that the user has given us a new password, let us
* change the database.
*/
pw_init();
tfd = pw_lock(0);
if (tfd < 0) {
warnx ("The passwd file is busy, waiting...");
tfd = pw_lock(10);
if (tfd < 0)
errx(1, "The passwd file is still busy, "
"try again later.");
}
pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
if (pfd < 0)
pw_error(_PATH_MASTERPASSWD, 1, 1);
pw_copy(pfd, tfd, pw, &old_pw);
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if (pw_mkdb() < 0)
pw_error((char *)NULL, 0, 1);
return (0);
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}