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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Authors: Jeffrey Stedfast <fejj@ximian.com>
*
* Copyright 2001 Ximian, Inc. (www.ximian.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
*
*/
#include <config.h>
#ifdef HAVE_KRB4
#include <krb.h>
/* MIT krb4 des.h #defines _. Sigh. We don't need it. #undef it here
* so we get the gettexty _ definition later.
*/
#undef _
#include "camel-sasl-kerberos4.h"
#include "camel-service.h"
#include <string.h>
CamelServiceAuthType camel_sasl_kerberos4_authtype = {
N_("Kerberos 4"),
N_("This option will connect to the server using "
"Kerberos 4 authentication."),
"KERBEROS_V4",
FALSE
};
#define KERBEROS_V4_PROTECTION_NONE 1
#define KERBEROS_V4_PROTECTION_INTEGRITY 2
#define KERBEROS_V4_PROTECTION_PRIVACY 4
static CamelSaslClass *parent_class = NULL;
/* Returns the class for a CamelSaslKerberos4 */
#define CSK4_CLASS(so) CAMEL_SASL_KERBEROS4_CLASS (CAMEL_OBJECT_GET_CLASS (so))
static GByteArray *krb4_challenge (CamelSasl *sasl, GByteArray *token, CamelException *ex);
struct _CamelSaslKerberos4Private {
int state;
guint32 nonce_n;
guint32 nonce_h;
des_cblock session;
des_key_schedule schedule;
};
static void
camel_sasl_kerberos4_class_init (CamelSaslKerberos4Class *camel_sasl_kerberos4_class)
{
CamelSaslClass *camel_sasl_class = CAMEL_SASL_CLASS (camel_sasl_kerberos4_class);
parent_class = CAMEL_SASL_CLASS (camel_type_get_global_classfuncs (camel_sasl_get_type ()));
/* virtual method overload */
camel_sasl_class->challenge = krb4_challenge;
}
static void
camel_sasl_kerberos4_init (gpointer object, gpointer klass)
{
CamelSaslKerberos4 *sasl_krb4 = CAMEL_SASL_KERBEROS4 (object);
sasl_krb4->priv = g_new0 (struct _CamelSaslKerberos4Private, 1);
}
static void
camel_sasl_kerberos4_finalize (CamelObject *object)
{
CamelSaslKerberos4 *sasl = CAMEL_SASL_KERBEROS4 (object);
if (sasl->priv) {
memset (sasl->priv, 0, sizeof (sasl->priv));
g_free (sasl->priv);
}
}
CamelType
camel_sasl_kerberos4_get_type (void)
{
static CamelType type = CAMEL_INVALID_TYPE;
if (type == CAMEL_INVALID_TYPE) {
type = camel_type_register (camel_sasl_get_type (),
"CamelSaslKerberos4",
sizeof (CamelSaslKerberos4),
sizeof (CamelSaslKerberos4Class),
(CamelObjectClassInitFunc) camel_sasl_kerberos4_class_init,
NULL,
(CamelObjectInitFunc) camel_sasl_kerberos4_init,
(CamelObjectFinalizeFunc) camel_sasl_kerberos4_finalize);
}
return type;
}
static GByteArray *
krb4_challenge (CamelSasl *sasl, GByteArray *token, CamelException *ex)
{
struct _CamelSaslKerberos4Private *priv = CAMEL_SASL_KERBEROS4 (sasl)->priv;
GByteArray *ret = NULL;
char *inst, *realm, *username;
struct hostent *h;
int status, len;
KTEXT_ST authenticator;
CREDENTIALS credentials;
guint32 plus1;
/* Need to wait for the server */
if (!token)
return NULL;
switch (priv->state) {
case 0:
if (token->len != 4)
goto lose;
memcpy (&priv->nonce_n, token->data, 4);
priv->nonce_h = ntohl (priv->nonce_n);
/* Our response is an authenticator including that number. */
h = camel_service_gethost (sasl->service, ex);
inst = g_strndup (h->h_name, strcspn (h->h_name, "."));
g_strdown (inst);
realm = g_strdup (krb_realmofhost (h->h_name));
status = krb_mk_req (&authenticator, sasl->service_name, inst, realm, priv->nonce_h);
if (status == KSUCCESS) {
status = krb_get_cred (sasl->service_name, inst, realm, &credentials);
memcpy (priv->session, credentials.session, sizeof (priv->session));
memset (&credentials, 0, sizeof (credentials));
}
g_free (inst);
g_free (realm);
if (status != KSUCCESS) {
camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE,
_("Could not get Kerberos ticket:\n%s"),
krb_err_txt[status]);
goto lose;
}
des_key_sched (&priv->session, priv->schedule);
ret = g_byte_array_new ();
g_byte_array_append (ret, (const guint8 *)authenticator.dat, authenticator.length);
break;
case 1:
if (token->len != 8)
goto lose;
/* This one is encrypted. */
des_ecb_encrypt ((des_cblock *)token->data, (des_cblock *)token->data, priv->schedule, 0);
/* Check that the returned value is the original nonce plus one. */
memcpy (&plus1, token->data, 4);
if (ntohl (plus1) != priv->nonce_h + 1)
goto lose;
/* "the fifth octet contain[s] a bit-mask specifying the
* protection mechanisms supported by the server"
*/
if (!(token->data[4] & KERBEROS_V4_PROTECTION_NONE)) {
g_warning ("Server does not support `no protection' :-(");
goto lose;
}
username = sasl->service->url->user;
len = strlen (username) + 9;
len += 8 - len % 8;
ret = g_byte_array_new ();
g_byte_array_set_size (ret, len);
memset (ret->data, 0, len);
memcpy (ret->data, &priv->nonce_n, 4);
ret->data[4] = KERBEROS_V4_PROTECTION_NONE;
ret->data[5] = ret->data[6] = ret->data[7] = 0;
strcpy (ret->data + 8, username);
des_pcbc_encrypt ((void *)ret->data, (void *)ret->data, len,
priv->schedule, &priv->session, 1);
memset (&priv->session, 0, sizeof (priv->session));
sasl->authenticated = TRUE;
break;
}
priv->state++;
return ret;
lose:
memset (&priv->session, 0, sizeof (priv->session));
if (!camel_exception_is_set (ex)) {
camel_exception_set (ex, CAMEL_EXCEPTION_SERVICE_CANT_AUTHENTICATE,
_("Bad authentication response from server."));
}
return NULL;
}
#endif /* HAVE_KRB4 */
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