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/*
* Copyright (c) 1999-2005, 2007 Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif /* HAVE_STRING_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <pwd.h>
#include <krb.h>
#include "sudo.h"
#include "sudo_auth.h"
#ifndef lint
__unused static const char rcsid[] = "$Sudo: kerb4.c,v 1.16 2008/11/09 14:13:13 millert Exp $";
#endif /* lint */
int
kerb4_init(pw, promptp, auth)
struct passwd *pw;
char **promptp;
sudo_auth *auth;
{
static char realm[REALM_SZ];
/* Don't try to verify root */
if (pw->pw_uid == 0)
return(AUTH_FAILURE);
/* Get the local realm, or retrun failure (no krb.conf) */
if (krb_get_lrealm(realm, 1) != KSUCCESS)
return(AUTH_FAILURE);
/* Stash a pointer to the realm (used in kerb4_verify) */
auth->data = (void *) realm;
return(AUTH_SUCCESS);
}
int
kerb4_verify(pw, pass, auth)
struct passwd *pw;
char *pass;
sudo_auth *auth;
{
char tkfile[sizeof(_PATH_SUDO_TIMEDIR) + 4 + MAX_UID_T_LEN];
char *realm = (char *) auth->data;
int error;
/*
* Set the ticket file to be in sudo sudo timedir so we don't
* wipe out other (real) kerberos tickets.
*/
(void) snprintf(tkfile, sizeof(tkfile), "%s/tkt%lu",
_PATH_SUDO_TIMEDIR, (unsigned long) pw->pw_uid);
(void) krb_set_tkt_string(tkfile);
/* Convert the password to a ticket given. */
error = krb_get_pw_in_tkt(pw->pw_name, "", realm, "krbtgt", realm,
DEFAULT_TKT_LIFE, pass);
switch (error) {
case INTK_OK:
dest_tkt(); /* we are done with the temp ticket */
return(AUTH_SUCCESS);
break;
case INTK_BADPW:
case KDC_PR_UNKNOWN:
break;
default:
(void) fprintf(stderr, "Warning: Kerberos error: %s\n",
krb_err_txt[error]);
}
return(AUTH_FAILURE);
}
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