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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 <e-util/md5-utils.h>
#include <stdio.h>
#include <string.h>
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, const char *token, CamelException *ex);
enum {
STATE_AUTH,
STATE_FINAL
};
struct _CamelSaslCramMd5Private {
int state;
};
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;
}
static void
camel_sasl_cram_md5_init (gpointer object, gpointer klass)
{
CamelSaslCramMd5 *sasl_cram = CAMEL_SASL_CRAM_MD5 (object);
sasl_cram->priv = g_new0 (struct _CamelSaslCramMd5Private, 1);
}
static void
camel_sasl_cram_md5_finalize (CamelObject *object)
{
CamelSaslCramMd5 *sasl = CAMEL_SASL_CRAM_MD5 (object);
g_free (sasl->username);
g_free (sasl->priv);
}
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,
(CamelObjectInitFunc) camel_sasl_cram_md5_init,
(CamelObjectFinalizeFunc) camel_sasl_cram_md5_finalize);
}
return type;
}
CamelSasl *
camel_sasl_cram_md5_new (const char *username, const char *passwd)
{
CamelSaslCramMd5 *sasl_cram;
if (!username) return NULL;
if (!passwd) return NULL;
sasl_cram = CAMEL_SASL_CRAM_MD5 (camel_object_new (camel_sasl_cram_md5_get_type ()));
sasl_cram->username = g_strdup (username);
sasl_cram->passwd = g_strdup (passwd);
return CAMEL_SASL (sasl_cram);
}
/* CRAM-MD5 algorithm:
* MD5 ((passwd XOR opad), MD5 ((passwd XOR ipad), timestamp))
*/
static GByteArray *
cram_md5_challenge (CamelSasl *sasl, const char *token, CamelException *ex)
{
CamelSaslCramMd5 *sasl_cram = CAMEL_SASL_CRAM_MD5 (sasl);
struct _CamelSaslCramMd5Private *priv = sasl_cram->priv;
guchar digest[16], md5asc[33], *s, *p;
char *timestamp, *passwd, *buf;
GByteArray *ret = NULL;
guchar ipad[64];
guchar opad[64];
MD5Context ctx;
int i, pw_len;
switch (priv->state) {
case STATE_AUTH:
timestamp = g_strdup (token);
base64_decode_simple (timestamp, strlen (timestamp));
passwd = sasl_cram->passwd;
pw_len = strlen (sasl_cram->passwd);
if (pw_len > 64) {
md5_init (&ctx);
md5_update (&ctx, passwd, pw_len);
md5_final (&ctx, digest);
passwd = g_strdup (digest);
pw_len = 16;
}
memset (ipad, 0, sizeof (ipad));
memset (opad, 0, sizeof (opad));
memcpy (ipad, passwd, pw_len);
memcpy (opad, passwd, pw_len);
for (i = 0; i < 64; i++) {
ipad[i] ^= 0x36;
opad[i] ^= 0x5c;
}
md5_init (&ctx);
md5_update (&ctx, ipad, 64);
md5_update (&ctx, timestamp, strlen (timestamp));
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);
buf = g_strdup_printf ("%s %s", sasl_cram->username, md5asc);
ret = g_byte_array_new ();
g_byte_array_append (ret, buf, strlen (buf));
g_free (buf);
break;
case STATE_FINAL:
sasl->authenticated = TRUE;
default:
break;
}
priv->state++;
return ret;
}
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