185 lines
4.5 KiB
C
185 lines
4.5 KiB
C
/* $NetBSD: pw_gensalt.c,v 1.7 2009/01/18 12:15:27 lukem Exp $ */
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/*
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* Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
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* 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 Niels Provos.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from OpenBSD: pwd_gensalt.c,v 1.9 1998/07/05 21:08:32 provos Exp
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: pw_gensalt.c,v 1.7 2009/01/18 12:15:27 lukem Exp $");
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#endif /* not lint */
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#include <sys/syslimits.h>
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#include <sys/types.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 <limits.h>
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#include <err.h>
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#include <grp.h>
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#include <pwd.h>
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#include <util.h>
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#include <time.h>
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#include <errno.h>
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#include "crypt.h"
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static const struct pw_salt {
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const char *name;
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int (*gensalt)(char *, size_t, const char *);
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} salts[] = {
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{ "old", __gensalt_old },
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{ "new", __gensalt_new },
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{ "newsalt", __gensalt_new },
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{ "md5", __gensalt_md5 },
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{ "sha1", __gensalt_sha1 },
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{ "blowfish", __gensalt_blowfish },
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{ NULL, NULL }
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};
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static int
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getnum(const char *str, size_t *num)
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{
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char *ep;
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unsigned long rv;
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if (str == NULL) {
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*num = 0;
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return 0;
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}
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rv = strtoul(str, &ep, 0);
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if (str == ep || *ep) {
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errno = EINVAL;
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return -1;
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}
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if (errno == ERANGE && rv == ULONG_MAX)
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return -1;
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*num = (size_t)rv;
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return 0;
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}
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int
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/*ARGSUSED2*/
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__gensalt_old(char *salt, size_t saltsiz, const char *option)
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{
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if (saltsiz < 3) {
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errno = ENOSPC;
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return -1;
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}
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__crypt_to64(&salt[0], arc4random(), 2);
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salt[2] = '\0';
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return 0;
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}
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int
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/*ARGSUSED2*/
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__gensalt_new(char *salt, size_t saltsiz, const char* option)
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{
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size_t nrounds;
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if (saltsiz < 10) {
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errno = ENOSPC;
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return -1;
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}
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if (getnum(option, &nrounds) == -1)
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return -1;
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/* Check rounds, 24 bit is max */
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if (nrounds < 7250)
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nrounds = 7250;
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else if (nrounds > 0xffffff)
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nrounds = 0xffffff;
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salt[0] = _PASSWORD_EFMT1;
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__crypt_to64(&salt[1], (uint32_t)nrounds, 4);
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__crypt_to64(&salt[5], arc4random(), 4);
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salt[9] = '\0';
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return 0;
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}
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int
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/*ARGSUSED2*/
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__gensalt_md5(char *salt, size_t saltsiz, const char *option)
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{
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if (saltsiz < 13) { /* $1$8salt$\0 */
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errno = ENOSPC;
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return -1;
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}
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salt[0] = _PASSWORD_NONDES;
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salt[1] = '1';
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salt[2] = '$';
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__crypt_to64(&salt[3], arc4random(), 4);
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__crypt_to64(&salt[7], arc4random(), 4);
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salt[11] = '$';
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salt[12] = '\0';
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return 0;
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}
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int
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__gensalt_sha1(char *salt, size_t saltsiz, const char *option)
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{
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int n;
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size_t nrounds;
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if (getnum(option, &nrounds) == -1)
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return -1;
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n = snprintf(salt, saltsiz, "%s%u$", SHA1_MAGIC,
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__crypt_sha1_iterations(nrounds));
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/*
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* The salt can be up to 64 bytes, but 8
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* is considered enough for now.
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*/
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if ((size_t)n + 9 >= saltsiz)
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return 0;
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__crypt_to64(&salt[n], arc4random(), 4);
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__crypt_to64(&salt[n + 4], arc4random(), 4);
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salt[n + 8] = '$';
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salt[n + 9] = '\0';
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return 0;
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}
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int
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pw_gensalt(char *salt, size_t saltlen, const char *type, const char *option)
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{
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const struct pw_salt *sp;
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for (sp = salts; sp->name; sp++)
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if (strcmp(sp->name, type) == 0)
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return (*sp->gensalt)(salt, saltlen, option);
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errno = EINVAL;
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return -1;
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}
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