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/* $OpenBSD: radius_mppe.c,v 1.1 2015/07/20 23:52:29 yasuoka Exp $ */
/*-
* Copyright (c) 2013 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/md5.h>
#include "radius.h"
#include "radius_local.h"
int
radius_encrypt_mppe_key_attr(void *cipher, size_t * clen, const void *plain,
size_t plen, const void *ra, const char *secret)
{
size_t slen = strlen(secret);
uint8_t b[16], plain0[256], *p, *c;
size_t off;
MD5_CTX ctx;
unsigned int i;
uint16_t salt;
if (plen > 239)
return (-1);
if (*clen < ROUNDUP(plen + 1, 16) + 2)
return (-1);
salt = arc4random();
plain0[0] = plen;
memcpy(plain0 + 1, plain, plen);
memset(plain0 + 1 + plen, 0, ROUNDUP(plen + 1, 16) - (plen + 1));
*clen = ROUNDUP(plen + 1, 16) + 2;
memcpy(cipher, &salt, 2);
for (off = 0; off < *clen - 2; off += 16) {
c = ((uint8_t *)cipher) + 2 + off;
p = ((uint8_t *)plain0) + off;
MD5_Init(&ctx);
MD5_Update(&ctx, secret, slen);
if (off == 0) {
MD5_Update(&ctx, ra, 16);
MD5_Update(&ctx, cipher, 2);
} else
MD5_Update(&ctx, c - 16, 16);
MD5_Final(b, &ctx);
for (i = 0; i < 16; i++)
c[i] = p[i] ^ b[i];
}
return (0);
}
int
radius_decrypt_mppe_key_attr(void *plain, size_t * plen, const void *cipher,
size_t clen, const void *ra, const char *secret)
{
size_t slen = strlen(secret);
uint8_t b[16], plain0[256], *p, *c;
size_t off;
MD5_CTX ctx;
unsigned int i;
if (clen < 18 || clen > 255)
return (-1);
if ((clen - 2) % 16 != 0)
return (-1);
if (*plen < clen - 3)
return (-1);
for (off = 0; off < clen - 2; off += 16) {
c = ((uint8_t *)cipher) + 2 + off;
p = ((uint8_t *)plain0) + off;
MD5_Init(&ctx);
MD5_Update(&ctx, secret, slen);
if (off == 0) {
MD5_Update(&ctx, ra, 16);
MD5_Update(&ctx, cipher, 2);
} else
MD5_Update(&ctx, c - 16, 16);
MD5_Final(b, &ctx);
for (i = 0; i < 16; i++)
p[i] = c[i] ^ b[i];
}
if (plain0[0] > clen - 3)
return (-1);
*plen = plain0[0];
memcpy(plain, plain0 + 1, *plen);
return (0);
}
static int
radius_get_mppe_key_attr(const RADIUS_PACKET * packet, uint8_t vtype,
void *buf, size_t * len, const char *secret)
{
uint8_t cipher[256];
size_t clen = sizeof(cipher);
if (radius_get_vs_raw_attr(packet, RADIUS_VENDOR_MICROSOFT, vtype,
cipher, &clen) != 0)
return (-1);
if (radius_decrypt_mppe_key_attr(buf, len, cipher, clen,
radius_get_request_authenticator_retval(packet), secret) != 0)
return (-1);
return (0);
}
static int
radius_put_mppe_key_attr(RADIUS_PACKET * packet, uint8_t vtype,
const void *buf, size_t len, const char *secret)
{
uint8_t cipher[256];
size_t clen = sizeof(cipher);
if (radius_encrypt_mppe_key_attr(cipher, &clen, buf, len,
radius_get_request_authenticator_retval(packet), secret) != 0)
return (-1);
if (radius_put_vs_raw_attr(packet, RADIUS_VENDOR_MICROSOFT, vtype,
cipher, clen) != 0)
return (-1);
return (0);
}
int
radius_get_mppe_send_key_attr(const RADIUS_PACKET * packet, void *buf,
size_t * len, const char *secret)
{
return (radius_get_mppe_key_attr(packet, RADIUS_VTYPE_MPPE_SEND_KEY,
buf, len, secret));
}
int
radius_put_mppe_send_key_attr(RADIUS_PACKET * packet, const void *buf,
size_t len, const char *secret)
{
return (radius_put_mppe_key_attr(packet, RADIUS_VTYPE_MPPE_SEND_KEY,
buf, len, secret));
}
int
radius_get_mppe_recv_key_attr(const RADIUS_PACKET * packet, void *buf,
size_t * len, const char *secret)
{
return (radius_get_mppe_key_attr(packet, RADIUS_VTYPE_MPPE_RECV_KEY,
buf, len, secret));
}
int
radius_put_mppe_recv_key_attr(RADIUS_PACKET * packet, const void *buf,
size_t len, const char *secret)
{
return (radius_put_mppe_key_attr(packet, RADIUS_VTYPE_MPPE_RECV_KEY,
buf, len, secret));
}
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