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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
*
* This library is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation.
*
* This library 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Jeffrey Stedfast <fejj@ximian.com>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <glib/gi18n-lib.h>
#include "camel-mime-utils.h"
#include "camel-network-settings.h"
#include "camel-sasl-cram-md5.h"
#include "camel-service.h"
#define CAMEL_SASL_CRAM_MD5_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE \
((obj), CAMEL_TYPE_SASL_CRAM_MD5, CamelSaslCramMd5Private))
struct _CamelSaslCramMd5Private {
gint placeholder; /* allow for future expansion */
};
static CamelServiceAuthType sasl_cram_md5_auth_type = {
N_("CRAM-MD5"),
N_("This option will connect to the server using a "
"secure CRAM-MD5 password, if the server supports it."),
"CRAM-MD5",
TRUE
};
G_DEFINE_TYPE (CamelSaslCramMd5, camel_sasl_cram_md5, CAMEL_TYPE_SASL)
/* CRAM-MD5 algorithm:
* MD5 ((passwd XOR opad), MD5 ((passwd XOR ipad), timestamp))
*/
static GByteArray *
sasl_cram_md5_challenge_sync (CamelSasl *sasl,
GByteArray *token,
GCancellable *cancellable,
GError **error)
{
CamelNetworkSettings *network_settings;
CamelSettings *settings;
CamelService *service;
GChecksum *checksum;
guint8 *digest;
gsize length;
const gchar *hex;
const gchar *password;
GByteArray *ret = NULL;
guchar ipad[64];
guchar opad[64];
gchar *user;
gint i, pw_len;
/* Need to wait for the server */
if (!token)
return NULL;
service = camel_sasl_get_service (sasl);
settings = camel_service_ref_settings (service);
g_return_val_if_fail (CAMEL_IS_NETWORK_SETTINGS (settings), NULL);
network_settings = CAMEL_NETWORK_SETTINGS (settings);
user = camel_network_settings_dup_user (network_settings);
g_object_unref (settings);
g_return_val_if_fail (user != NULL, NULL);
password = camel_service_get_password (service);
g_return_val_if_fail (password != NULL, NULL);
length = g_checksum_type_get_length (G_CHECKSUM_MD5);
digest = g_alloca (length);
memset (ipad, 0, sizeof (ipad));
memset (opad, 0, sizeof (opad));
pw_len = strlen (password);
if (pw_len <= 64) {
memcpy (ipad, password, pw_len);
memcpy (opad, password, pw_len);
} else {
checksum = g_checksum_new (G_CHECKSUM_MD5);
g_checksum_update (checksum, (guchar *) password, pw_len);
g_checksum_get_digest (checksum, digest, &length);
g_checksum_free (checksum);
memcpy (ipad, digest, length);
memcpy (opad, digest, length);
}
for (i = 0; i < 64; i++) {
ipad[i] ^= 0x36;
opad[i] ^= 0x5c;
}
checksum = g_checksum_new (G_CHECKSUM_MD5);
g_checksum_update (checksum, (guchar *) ipad, sizeof (ipad));
g_checksum_update (checksum, (guchar *) token->data, token->len);
g_checksum_get_digest (checksum, digest, &length);
g_checksum_free (checksum);
checksum = g_checksum_new (G_CHECKSUM_MD5);
g_checksum_update (checksum, (guchar *) opad, sizeof (opad));
g_checksum_update (checksum, (guchar *) digest, length);
/* String is owned by the checksum. */
hex = g_checksum_get_string (checksum);
ret = g_byte_array_new ();
g_byte_array_append (ret, (guint8 *) user, strlen (user));
g_byte_array_append (ret, (guint8 *) " ", 1);
g_byte_array_append (ret, (guint8 *) hex, strlen (hex));
g_checksum_free (checksum);
camel_sasl_set_authenticated (sasl, TRUE);
g_free (user);
return ret;
}
static void
camel_sasl_cram_md5_class_init (CamelSaslCramMd5Class *class)
{
CamelSaslClass *sasl_class;
g_type_class_add_private (class, sizeof (CamelSaslCramMd5Private));
sasl_class = CAMEL_SASL_CLASS (class);
sasl_class->auth_type = &sasl_cram_md5_auth_type;
sasl_class->challenge_sync = sasl_cram_md5_challenge_sync;
}
static void
camel_sasl_cram_md5_init (CamelSaslCramMd5 *sasl)
{
sasl->priv = CAMEL_SASL_CRAM_MD5_GET_PRIVATE (sasl);
}
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