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/* $OpenBSD: pwd_gensalt.c,v 1.27 2010/07/11 15:53:12 dhill 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/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 *, u_int32_t, int n);
int pwd_gensalt(char *, int, login_cap_t *, char);
#define YPCIPHER_DEF "old"
#define LOCALCIPHER_DEF "blowfish,6"
int
pwd_gensalt(char *salt, int saltlen, login_cap_t *lc, char type)
{
char *next, *now, *oldnext;
*salt = '\0';
switch (type) {
case 'y':
next = login_getcapstr(lc, "ypcipher", NULL, NULL);
if (next == NULL && (next = strdup(YPCIPHER_DEF)) == NULL) {
warn(NULL);
return 0;
}
break;
case 'l':
default:
next = login_getcapstr(lc, "localcipher", NULL, NULL);
if (next == NULL && (next = strdup(LOCALCIPHER_DEF)) == NULL) {
warn(NULL);
return 0;
}
break;
}
oldnext = next;
now = strsep(&next, ",");
if (!strcmp(now, "old")) {
if (saltlen < 3) {
free(oldnext);
return 0;
}
to64(&salt[0], arc4random(), 2);
salt[2] = '\0';
} else if (!strcmp(now, "newsalt")) {
u_int32_t rounds = 7250;
if (next)
rounds = atol(next);
if (saltlen < 10) {
free(oldnext);
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 */
free(oldnext);
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 = 6;
if (next)
rounds = atoi(next);
if (rounds < 4)
rounds = 4;
if (rounds > 31)
rounds = 31;
strlcpy(salt, bcrypt_gensalt(rounds), saltlen);
} else {
warnx("Unknown option %s.", now);
free(oldnext);
return 0;
}
free(oldnext);
return 1;
}
static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
void
to64(char *s, u_int32_t v, int n)
{
while (--n >= 0) {
*s++ = itoa64[v&0x3f];
v >>= 6;
}
}
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