Return to pwd_gensalt.c CVS log

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Simplify some things now that we only have login.conf to worry about
and fix two bugs introduced in the last commit (a duplicate free
and reversed logic for the default cipher types).

/*	$OpenBSD: pwd_gensalt.c,v 1.19 2004/07/13 21:29:12 millert Exp $ */

/*
 * 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 <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <grp.h>
#include <pwd.h>
#include <time.h>
#include <login_cap.h>

void	to64(char *, int32_t, int n);
char	*bcrypt_gensalt(u_int8_t);
int	pwd_gensalt(char *, int, login_cap_t *, char);

int
pwd_gensalt(char *salt, int saltlen, login_cap_t *lc, char type)
{
	char *next, *now, *cipher;

	*salt = '\0';

	switch (type) {
	case 'y':
		cipher = "ypcipher";
		break;
	case 'l':
	default:
		cipher = "localcipher";
		break;
	}

	if ((next = login_getcapstr(lc, cipher, NULL, NULL)) == NULL) {
		if (type == 'y')
			next = "old";
		else		
			next = "blowfish,6";
	}

	now = strsep(&next, ",");
	if (!strcmp(now, "old")) {
		if (saltlen < 3)
			return 0;
		to64(&salt[0], arc4random(), 2);
		salt[2] = '\0';
	} else if (!strcmp(now, "newsalt")) {
		u_int32_t rounds = atol(next);

		if (saltlen < 10)
			return 0;
		/* Check rounds, 24 bit is max */
		if (rounds < 7250)
			rounds = 7250;
		else if (rounds > 0xffffff)
			rounds = 0xffffff;
		salt[0] = _PASSWORD_EFMT1;
		to64(&salt[1], (u_int32_t) rounds, 4);
		to64(&salt[5], arc4random(), 4);
		salt[9] = '\0';
	} else if (!strcmp(now, "md5")) {
		if (saltlen < 13)	/* $1$8salt$\0 */
			return 0;

		strlcpy(salt, "$1$", saltlen);
		to64(&salt[3], arc4random(), 4);
		to64(&salt[7], arc4random(), 4);
		strlcpy(&salt[11], "$", saltlen - 11);
	} else if (!strcmp(now, "blowfish")) {
		int rounds = atoi(next);

		if (rounds < 4)
			rounds = 4;
		strlcpy(salt, bcrypt_gensalt(rounds), saltlen);
	} else {
		strlcpy(salt, ":", saltlen);
		warnx("Unknown option %s.", now);
	}
	return 1;
}

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

void
to64(char *s, int32_t v, int n)
{
	while (--n >= 0) {
		*s++ = itoa64[v&0x3f];
		v >>= 6;
	}
}