227 lines
5.9 KiB
C
227 lines
5.9 KiB
C
/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: local_passwd.c,v 1.19 1998/03/07 21:42:07 ache Exp $
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*/
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#ifndef lint
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static const char sccsid[] = "@(#)local_passwd.c 8.3 (Berkeley) 4/2/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <pw_copy.h>
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#include <pw_util.h>
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#ifdef YP
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#include <pw_yp.h>
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#endif
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#ifdef LOGGING
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#include <syslog.h>
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#endif
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#ifdef LOGIN_CAP
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#ifdef AUTH_NONE /* multiple defs :-( */
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#undef AUTH_NONE
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#endif
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#include <login_cap.h>
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#endif
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#include "extern.h"
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static uid_t uid;
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int randinit;
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char *tempname;
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static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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void
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to64(s, v, n)
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char *s;
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long v;
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int n;
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{
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while (--n >= 0) {
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*s++ = itoa64[v&0x3f];
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v >>= 6;
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}
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}
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char *
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getnewpasswd(pw, nis)
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struct passwd *pw;
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int nis;
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{
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int tries, min_length = 6;
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char *p, *t;
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#ifdef LOGIN_CAP
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login_cap_t * lc;
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#endif
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char buf[_PASSWORD_LEN+1], salt[10];
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struct timeval tv;
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if (!nis)
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(void)printf("Changing local password for %s.\n", pw->pw_name);
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if (uid && pw->pw_passwd[0] &&
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strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
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pw->pw_passwd)) {
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errno = EACCES;
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pw_error(NULL, 1, 1);
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}
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#ifdef LOGIN_CAP
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/*
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* Determine minimum password length and next password change date.
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* Note that even for NIS passwords, login_cap is still used.
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*/
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if ((lc = login_getpwclass(pw)) != NULL) {
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time_t period;
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/* minpasswordlen capablity */
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min_length = (int)login_getcapnum(lc, "minpasswordlen",
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min_length, min_length);
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/* passwordtime capability */
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period = login_getcaptime(lc, "passwordtime", 0, 0);
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if (period > (time_t)0) {
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pw->pw_change = time(NULL) + period;
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}
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login_close(lc);
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}
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#endif
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for (buf[0] = '\0', tries = 0;;) {
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p = getpass("New password:");
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if (!*p) {
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(void)printf("Password unchanged.\n");
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pw_error(NULL, 0, 0);
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}
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if (strlen(p) < min_length && (uid != 0 || ++tries < 2)) {
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(void)printf("Please enter a password at least %d characters in length.\n", min_length);
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continue;
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}
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for (t = p; *t && islower(*t); ++t);
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if (!*t && (uid != 0 || ++tries < 2)) {
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(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;
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}
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(void)strcpy(buf, p);
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if (!strcmp(buf, getpass("Retype new password:")))
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break;
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(void)printf("Mismatch; try again, EOF to quit.\n");
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}
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/* grab a random printable character that isn't a colon */
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if (!randinit) {
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randinit = 1;
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srandomdev();
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}
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#ifdef NEWSALT
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salt[0] = _PASSWORD_EFMT1;
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to64(&salt[1], (long)(29 * 25), 4);
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to64(&salt[5], random(), 4);
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salt[9] = '\0';
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#else
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/* Make a good size salt for algoritms that can use it. */
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gettimeofday(&tv,0);
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if (strncmp(pw->pw_passwd, "$1$", 3)) {
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/* DES Salt */
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to64(&salt[0], random(), 3);
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to64(&salt[3], tv.tv_usec, 3);
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to64(&salt[6], tv.tv_sec, 2);
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salt[8] = '\0';
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}
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else {
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/* MD5 Salt */
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strncpy(&salt[0], "$1$", 3);
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to64(&salt[3], random(), 3);
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to64(&salt[6], tv.tv_usec, 3);
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salt[8] = '\0';
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}
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#endif
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return (crypt(buf, salt));
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}
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int
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local_passwd(uname)
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char *uname;
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{
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struct passwd *pw;
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int pfd, tfd;
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if (!(pw = getpwnam(uname)))
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errx(1, "unknown user %s", uname);
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#ifdef YP
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/* Use the right password information. */
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pw = (struct passwd *)&local_password;
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#endif
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uid = getuid();
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if (uid && uid != pw->pw_uid)
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errx(1, "%s", strerror(EACCES));
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pw_init();
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/*
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* Get the new password. Reset passwd change time to zero by
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* default. If the user has a valid login class (or the default
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* fallback exists), then the next password change date is set
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* by getnewpasswd() according to the "passwordtime" capability
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* if one has been specified.
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*/
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pw->pw_change = 0;
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pw->pw_passwd = getnewpasswd(pw, 0);
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pfd = pw_lock();
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tfd = pw_tmp();
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pw_copy(pfd, tfd, pw);
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if (!pw_mkdb(uname))
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pw_error((char *)NULL, 0, 1);
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#ifdef LOGGING
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syslog(LOG_DEBUG, "user %s changed their local password\n", uname);
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#endif
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return (0);
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}
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