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/* $OpenBSD: cryptutil.c,v 1.1 2014/05/12 19:13:14 tedu Exp $ */
/*
* Copyright (c) 2014 Ted Unangst <tedu@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <pwd.h>
#include <errno.h>
int
crypt_checkpass(const char *pass, const char *goodhash)
{
char dummy[_PASSWORD_LEN];
char *res;
if (goodhash == NULL) {
/* fake it */
bcrypt_newhash(pass, 8, dummy, sizeof(dummy));
goto fail;
}
/* empty password */
if (strlen(goodhash) == 0 && strlen(pass) == 0)
return 0;
if (goodhash[0] == '$' && goodhash[1] == '2') {
return bcrypt_checkpass(pass, goodhash);
}
/* have to do it the hard way */
res = crypt(pass, goodhash);
if (strlen(res) != strlen(goodhash) ||
timingsafe_bcmp(res, goodhash, strlen(goodhash)) != 0) {
goto fail;
}
return 0;
fail:
errno = EACCES;
return -1;
}
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