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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>
#include "camel-sasl-cram-md5.h"
#include "camel-mime-utils.h"
#include "camel-service.h"
#include <e-util/md5-utils.h>
#include <stdio.h>
#include <string.h>
CamelServiceAuthType camel_sasl_cram_md5_authtype = {
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
};
static CamelSaslClass *parent_class = NULL;
/* Returns the class for a CamelSaslCramMd5 */
#define CSCM_CLASS(so) CAMEL_SASL_CRAM_MD5_CLASS (CAMEL_OBJECT_GET_CLASS (so))
static GByteArray *cram_md5_challenge (CamelSasl *sasl, GByteArray *token, CamelException *ex);
static void
camel_sasl_cram_md5_class_init (CamelSaslCramMd5Class *camel_sasl_cram_md5_class)
{
CamelSaslClass *camel_sasl_class = CAMEL_SASL_CLASS (camel_sasl_cram_md5_class);
parent_class = CAMEL_SASL_CLASS (camel_type_get_global_classfuncs (camel_sasl_get_type ()));
/* virtual method overload */
camel_sasl_class->challenge = cram_md5_challenge;
}
CamelType
camel_sasl_cram_md5_get_type (void)
{
static CamelType type = CAMEL_INVALID_TYPE;
if (type == CAMEL_INVALID_TYPE) {
type = camel_type_register (camel_sasl_get_type (),
"CamelSaslCramMd5",
sizeof (CamelSaslCramMd5),
sizeof (CamelSaslCramMd5Class),
(CamelObjectClassInitFunc) camel_sasl_cram_md5_class_init,
NULL,
NULL,
NULL);
}
return type;
}
/* CRAM-MD5 algorithm:
* MD5 ((passwd XOR opad), MD5 ((passwd XOR ipad), timestamp))
*/
static GByteArray *
cram_md5_challenge (CamelSasl *sasl, GByteArray *token, CamelException *ex)
{
char *passwd;
guchar digest[16], md5asc[33], *s, *p;
GByteArray *ret = NULL;
guchar ipad[64];
guchar opad[64];
MD5Context ctx;
int i, pw_len;
/* Need to wait for the server */
if (!token)
return NULL;
g_return_val_if_fail (sasl->service->url->passwd != NULL, NULL);
memset (ipad, 0, sizeof (ipad));
memset (opad, 0, sizeof (opad));
passwd = sasl->service->url->passwd;
pw_len = strlen (passwd);
if (pw_len <= 64) {
memcpy (ipad, passwd, pw_len);
memcpy (opad, passwd, pw_len);
} else {
md5_get_digest (passwd, pw_len, ipad);
memcpy (opad, ipad, 16);
}
for (i = 0; i < 64; i++) {
ipad[i] ^= 0x36;
opad[i] ^= 0x5c;
}
md5_init (&ctx);
md5_update (&ctx, ipad, 64);
md5_update (&ctx, token->data, token->len);
md5_final (&ctx, digest);
md5_init (&ctx);
md5_update (&ctx, opad, 64);
md5_update (&ctx, digest, 16);
md5_final (&ctx, digest);
/* lowercase hexify that bad-boy... */
for (s = digest, p = md5asc; p < md5asc + 32; s++, p += 2)
sprintf (p, "%.2x", *s);
ret = g_byte_array_new ();
g_byte_array_append (ret, sasl->service->url->user, strlen (sasl->service->url->user));
g_byte_array_append (ret, " ", 1);
g_byte_array_append (ret, md5asc, 32);
sasl->authenticated = TRUE;
return ret;
}
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