Date: Wed, 20 Sep 1995 09:20:51 +0200 (MET DST) From: Ollivier Robert <roberto@keltia.Freenix.FR> To: mark@grondar.za (Mark Murray) Cc: clary@s4.elec.uq.edu.au, freebsd-security@FreeBSD.org Subject: Re: crack for freebsd Message-ID: <199509200720.JAA18979@keltia.Freenix.FR> In-Reply-To: <199509200555.HAA03406@grumble.grondar.za> from "Mark Murray" at Sep 20, 95 07:55:38 am
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It seems that Mark Murray said:
> Any version of crack will work, as long as you link against FreeBSD's
> -lcrypt. This libriary is a link to the current encryption scheme, so
> upgrading libcrypt MD5 -> DES will be transparent to all apps (including
> crack).
Hmm, you'll have to deal with longer-than-2-characters salt and a much
longer password. And the structure of the encrypted password is different
(magic # and separators). Here is the code I used for my su-like tool
(gives root priv. to some persons -- written in a list -- with the guy own
password).
#ifdef __FreeBSD__ /* cope with MD5 based crypt(3) */
if (!strncmp (calife->pw_passwd, "$1$", 3)) /* MD5 */
{
char * pp = (char *) xalloc (1, strlen (calife->pw_passwd) + 1);
char * md5_salt;
char * md5_pass;
strcpy (pp, calife->pw_passwd + 3);
md5_salt = strtok (pp, "$");
md5_pass = strtok (NULL, "$");
if (md5_pass == NULL ||
md5_salt == NULL ||
(strlen (md5_salt) > 8)) /* garbled password */
{
syslog (LOG_AUTH | LOG_ERR, "GARBLED PASSWORD %s to unknown %s on %s", name, user_to_be, tty);
fprintf (stderr, "Bad password string.\n");
fflush (stderr);
exit (8);
}
MESSAGE_1 ("MD5 password found, salt=%s\n", md5_salt);
strcpy (salt, md5_salt);
free (pp);
}
else
{
#endif /* !__FreeBSD__ */
strncpy (salt, calife->pw_passwd, 2);
salt [2] = '\0';
#ifdef __FreeBSD__
}
#endif /* __FreeBSD__ */
--
Ollivier ROBERT -=- The daemon is FREE! -=- roberto@keltia.frmug.fr.net
FreeBSD keltia.Freenix.FR 2.2-CURRENT #1: Sun Sep 10 18:50:19 MET DST 1995
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