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/* $OpenBSD: radius_msgauth.c,v 1.2 2021/12/16 17:32:51 tb Exp $ */
/*-
* Copyright (c) 2009 Internet Initiative Japan Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE"AUTHOR" AND CONTRIBUTORS AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/hmac.h>
#include "radius.h"
#include "radius_local.h"
static int
radius_calc_message_authenticator(RADIUS_PACKET * packet, const char *secret,
void *ma)
{
const RADIUS_ATTRIBUTE *attr;
const RADIUS_ATTRIBUTE *end;
u_char zero16[16];
HMAC_CTX *ctx;
int mdlen;
int ret = -1;
memset(zero16, 0, sizeof(zero16));
if ((ctx = HMAC_CTX_new()) == NULL)
goto err;
if (!HMAC_Init_ex(ctx, secret, strlen(secret), EVP_md5(), NULL))
goto err;
/*
* Traverse the radius packet.
*/
if (packet->request != NULL) {
if (!HMAC_Update(ctx, (const u_char *)packet->pdata, 4))
goto err;
if (!HMAC_Update(ctx, (unsigned char *)packet->request->pdata
->authenticator, 16))
goto err;
} else {
if (!HMAC_Update(ctx, (const u_char *)packet->pdata,
sizeof(RADIUS_PACKET_DATA)))
goto err;
}
attr = ATTRS_BEGIN(packet->pdata);
end = ATTRS_END(packet->pdata);
for (; attr < end; ATTRS_ADVANCE(attr)) {
if (attr->type == RADIUS_TYPE_MESSAGE_AUTHENTICATOR) {
if (!HMAC_Update(ctx, (u_char *)attr, 2))
goto err;
if (!HMAC_Update(ctx, (u_char *)zero16, sizeof(zero16)))
goto err;
} else {
if (!HMAC_Update(ctx, (u_char *)attr,
(int)attr->length))
goto err;
}
}
if (!HMAC_Final(ctx, (u_char *)ma, &mdlen))
goto err;
ret = 0;
err:
HMAC_CTX_free(ctx);
return (ret);
}
int
radius_put_message_authenticator(RADIUS_PACKET * packet, const char *secret)
{
u_char ma[16];
/*
* It is not required to initialize ma
* because content of Message-Authenticator attribute is assumed zero
* during calculation.
*/
if (radius_put_raw_attr(packet, RADIUS_TYPE_MESSAGE_AUTHENTICATOR,
ma, sizeof(ma)) != 0)
return (-1);
return (radius_set_message_authenticator(packet, secret));
}
int
radius_set_message_authenticator(RADIUS_PACKET * packet, const char *secret)
{
u_char ma[16];
if (radius_calc_message_authenticator(packet, secret, ma) != 0)
return (-1);
return (radius_set_raw_attr(packet, RADIUS_TYPE_MESSAGE_AUTHENTICATOR,
ma, sizeof(ma)));
}
int
radius_check_message_authenticator(RADIUS_PACKET * packet, const char *secret)
{
int rval;
size_t len;
u_char ma0[16], ma1[16];
if (radius_calc_message_authenticator(packet, secret, ma0) != 0)
return (-1);
len = sizeof(ma1);
if ((rval = radius_get_raw_attr(packet,
RADIUS_TYPE_MESSAGE_AUTHENTICATOR, ma1, &len)) != 0)
return (rval);
if (len != sizeof(ma1))
return (-1);
return (memcmp(ma0, ma1, sizeof(ma1)));
}
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