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/*-
* Copyright (c) 1990, 1993, 1994
* 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.
*
* $Id: local_passwd.c,v 1.17 1997/05/10 19:02:38 davidn Exp $
*/
#ifndef lint
static const char sccsid[] = "@(#)local_passwd.c 8.3 (Berkeley) 4/2/94";
#endif /* not lint */
#include <sys/types.h>
#include <sys/time.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <pw_copy.h>
#include <pw_util.h>
#ifdef YP
#include <pw_yp.h>
#endif
#ifdef LOGGING
#include <syslog.h>
#endif
#ifdef LOGIN_CAP
#ifdef AUTH_NONE /* multiple defs :-( */
#undef AUTH_NONE
#endif
#include <login_cap.h>
#endif
#include "extern.h"
static uid_t uid;
int randinit;
char *tempname;
static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
void
to64(s, v, n)
char *s;
long v;
int n;
{
while (--n >= 0) {
*s++ = itoa64[v&0x3f];
v >>= 6;
}
}
char *
getnewpasswd(pw, nis)
struct passwd *pw;
int nis;
{
int tries, min_length = 6;
char *p, *t;
#ifdef LOGIN_CAP
login_cap_t * lc;
#endif
char buf[_PASSWORD_LEN+1], salt[10];
struct timeval tv;
if (!nis)
(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);
}
#ifdef LOGIN_CAP
/*
* Determine minimum password length and next password change date.
* Note that even for NIS passwords, login_cap is still used.
*/
if ((lc = login_getpwclass(pw)) != NULL) {
time_t period;
/* minpasswordlen capablity */
min_length = (int)login_getcapnum(lc, "minpasswordlen",
min_length, min_length);
/* passwordperiod capability */
period = login_getcaptime(lc, "passwordperiod", 0, 0);
if (period > (time_t)0) {
pw->pw_change = time(NULL) + period;
}
login_close(lc);
}
#endif
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) < min_length && (uid != 0 || ++tries < 2)) {
(void)printf("Please enter a password at least %d characters in length.\n", min_length);
continue;
}
for (t = p; *t && islower(*t); ++t);
if (!*t && (uid != 0 || ++tries < 2)) {
(void)printf("Please don't use an all-lower case password.\nUnusual capitalization, control characters or digits are suggested.\n");
continue;
}
(void)strcpy(buf, p);
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 */
if (!randinit) {
randinit = 1;
srandomdev();
}
#ifdef NEWSALT
salt[0] = _PASSWORD_EFMT1;
to64(&salt[1], (long)(29 * 25), 4);
to64(&salt[5], random(), 4);
salt[9] = '\0';
#else
/* Make a good size salt for algoritms that can use it. */
gettimeofday(&tv,0);
if (strncmp(pw->pw_passwd, "$1$", 3)) {
/* DES Salt */
to64(&salt[0], random(), 3);
to64(&salt[3], tv.tv_usec, 3);
to64(&salt[6], tv.tv_sec, 2);
salt[8] = '\0';
}
else {
/* MD5 Salt */
strncpy(&salt[0], "$1$", 3);
to64(&salt[3], random(), 3);
to64(&salt[6], tv.tv_usec, 3);
salt[8] = '\0';
}
#endif
return (crypt(buf, salt));
}
int
local_passwd(uname)
char *uname;
{
struct passwd *pw;
int pfd, tfd;
if (!(pw = getpwnam(uname)))
errx(1, "unknown user %s", uname);
#ifdef YP
/* Use the right password information. */
pw = (struct passwd *)&local_password;
#endif
uid = getuid();
if (uid && uid != pw->pw_uid)
errx(1, "%s", strerror(EACCES));
pw_init();
pfd = pw_lock();
tfd = pw_tmp();
/*
* Get the new password. Reset passwd change time to zero by
* default. If the user has a valid login class (or the default
* fallback exists), then the next password change date is set
* by getnewpasswd() according to the "passwordperiod" capability
* if one has been specified.
*/
pw->pw_change = 0;
pw->pw_passwd = getnewpasswd(pw, 0);
pw_copy(pfd, tfd, pw);
if (!pw_mkdb(uname))
pw_error((char *)NULL, 0, 1);
#ifdef LOGGING
syslog(LOG_DEBUG, "user %s changed their local password\n", uname);
#endif
return (0);
}
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