usr/src/usr.bin/passwd/local_passwd.c

/*-
 * 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.
 */

#ifndef lint
static char sccsid[] = "@(#)local_passwd.c      8.3 (Berkeley) 4/2/94";
#endif /* not lint */

#include <sys/types.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>

#include "extern.h"

static uid_t uid;

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)
        struct passwd *pw;
{
        int tries;
        char *p, *t;
        char buf[_PASSWORD_LEN+1], salt[9];

        (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);
        }

        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 && (uid != 0 || ++tries < 2)) {
                        (void)printf("Please enter a longer password.\n");
                        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 */
        (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));
}

int
local_passwd(uname)
        char *uname;
{
        struct passwd *pw;
        int pfd, tfd;

        if (!(pw = getpwnam(uname)))
                errx(1, "unknown user %s", uname);

        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; 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;
        pw_copy(pfd, tfd, pw);

        if (!pw_mkdb())
                pw_error((char *)NULL, 0, 1);
        return (0);
}