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support for md5 passwords

/*
 * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
 * 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 Niels Provos.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

#include <sys/syslimits.h>
#include <stdio.h>
#include <string.h>
#include <err.h>
#include <pwd.h>
#include <util.h>

void to64( char *, long, int n);

int
pwd_gensalt(salt, max, pwd, type)
	char   *salt;
	int     max;
	struct passwd *pwd;
	char    type;
{
	char   *bcrypt_gensalt __P((u_int8_t));
	char    option[LINE_MAX];
	char   *next, *now;
	*salt = '\0';

	switch (type) {
	case 'y':
		pw_getconf(option, LINE_MAX, pwd->pw_name, "ypcipher");
		break;
	case 'l':
	default:
		pw_getconf(option, LINE_MAX, pwd->pw_name, "localcipher");
		break;
	}

	next = option;
	now = strsep(&next, ",");
	if (!strcmp(now, "old")) {
		if( max < 3 )
			return 0;
		(void) srandom((int) time((time_t *) NULL));
		to64(&salt[0], random(), 2);
		salt[2] = '\0';
	} else if (!strcmp(now, "newsalt")) {
		if( max < 10 )
			return 0;
		(void) srandom((int) time((time_t *) NULL));
		salt[0] = _PASSWORD_EFMT1;
		to64(&salt[1], (long) (29 * 25), 4);
		to64(&salt[5], random(), 4);
		salt[9] = '\0';
	} else if (!strcmp(now, "md5")) {
		if( max < 13 )  /* $1$8salt$\0 */
			return 0;
		strcpy(salt, "$1$");
		(void) srandom((int) time((time_t *) NULL));
		to64(&salt[3], random(), 4);
		to64(&salt[7], random(), 4);
		strcpy(&salt[11], "$");
	} else if (!strcmp(now, "blowfish")) {
		int     rounds = atoi(next);
		if (rounds < 4)
			rounds = 4;
		strncpy(salt, bcrypt_gensalt(rounds), max - 1);
		salt[max - 1] = 0;
	} else {
		strcpy(salt, ":");
		warnx("Unkown option %s.", now);
	}
	return 1;
}

static unsigned char itoa64[] =         /* 0 ... 63 => ascii - 64 */
        "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

void to64(s, v, n)
        register char *s;
        register long v;
        register int n;
{
        while (--n >= 0) {
                *s++ = itoa64[v&0x3f];
                v >>= 6;
        }
}