304 lines
7.2 KiB
C
304 lines
7.2 KiB
C
/* $NetBSD: pw_gensalt.c,v 1.13 2021/10/20 13:03:29 nia 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 1.13 2021/10/20 13:03:29 nia 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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#ifdef HAVE_ARGON2
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#include <argon2.h>
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#define ARGON2_ARGON2_STR "argon2"
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#define ARGON2_ARGON2I_STR "argon2i"
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#define ARGON2_ARGON2D_STR "argon2d"
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#define ARGON2_ARGON2ID_STR "argon2id"
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crypt_private int
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estimate_argon2_params(argon2_type, uint32_t *, uint32_t *, uint32_t *);
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#endif /* HAVE_ARGON2 */
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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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#ifdef HAVE_ARGON2
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/* argon2 default to argon2id */
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{ "argon2", __gensalt_argon2id},
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{ "argon2id", __gensalt_argon2id},
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{ "argon2i", __gensalt_argon2i},
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{ "argon2d", __gensalt_argon2d},
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#endif /* HAVE_ARGON2 */
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{ NULL, NULL }
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};
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crypt_private 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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crypt_private 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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crypt_private 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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crypt_private 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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#ifdef HAVE_ARGON2
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static int
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__gensalt_argon2_decode_option(char *dst, size_t dlen,
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const char *option, argon2_type atype)
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{
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char *in = 0;
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char *a = 0;
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size_t tmp = 0;
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int error = 0;
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uint32_t memory = 0;
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uint32_t time = 0;
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uint32_t threads = 0;
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memset(dst, 0, dlen);
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if (option == NULL) {
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goto done;
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}
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in = strdup(option);
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while ((a = strsep(&in, ",")) != NULL) {
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switch (*a) {
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case 'm':
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a += strlen("m=");
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if ((getnum(a, &tmp)) == -1) {
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--error;
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} else {
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memory = tmp;
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}
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break;
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case 't':
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a += strlen("t=");
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if ((getnum(a, &tmp)) == -1) {
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--error;
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} else {
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time = tmp;
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}
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break;
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case 'p':
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a += strlen("p=");
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if ((getnum(a, &tmp)) == -1) {
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--error;
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} else {
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threads = tmp;
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}
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break;
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default:
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--error;
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}
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}
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free(in);
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done:
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/*
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* If parameters are unspecified, calculate some reasonable
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* ones based on system time.
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*/
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if (memory < ARGON2_MIN_MEMORY ||
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time < ARGON2_MIN_TIME ||
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threads < ARGON2_MIN_THREADS) {
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estimate_argon2_params(atype, &time, &memory, &threads);
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}
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snprintf(dst, dlen, "m=%d,t=%d,p=%d", memory, time, threads);
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return error;
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}
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static int
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__gensalt_argon2(char *salt, size_t saltsiz,
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const char *option, argon2_type atype)
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{
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int rc;
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int n;
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char buf[64];
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/* get param, enforcing order and applying defaults */
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if ((rc = __gensalt_argon2_decode_option(buf,
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sizeof(buf), option, atype)) < 0) {
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return 0;
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}
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n = snprintf(salt, saltsiz, "$%s$v=%d$%s$",
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argon2_type2string(atype,0), ARGON2_VERSION_NUMBER, buf);
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if ((size_t)n + 16 >= saltsiz) {
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return 0;
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}
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__crypt_tobase64(&salt[n], arc4random(), 4);
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__crypt_tobase64(&salt[n + 4], arc4random(), 4);
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__crypt_tobase64(&salt[n + 8], arc4random(), 4);
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__crypt_tobase64(&salt[n + 12], arc4random(), 4);
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salt[n + 16] = '$';
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salt[n + 17] = '\0';
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return 0;
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}
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/* argon2 variant-specific hooks to generic */
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crypt_private int
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__gensalt_argon2id(char *salt, size_t saltsiz, const char *option)
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{
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return __gensalt_argon2(salt, saltsiz, option, Argon2_id);
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}
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crypt_private int
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__gensalt_argon2i(char *salt, size_t saltsiz, const char *option)
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{
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return __gensalt_argon2(salt, saltsiz, option, Argon2_i);
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}
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crypt_private int
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__gensalt_argon2d(char *salt, size_t saltsiz, const char *option)
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{
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return __gensalt_argon2(salt, saltsiz, option, Argon2_d);
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}
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#endif /* HAVE_ARGON2 */
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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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