189 lines
5.1 KiB
C
189 lines
5.1 KiB
C
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/* $OpenBSD: radius_mppe.c,v 1.1 2015/07/20 23:52:29 yasuoka Exp $ */
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/*-
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* Copyright (c) 2013 Internet Initiative Japan Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE"AUTHOR" AND CONTRIBUTORS AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/md5.h>
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#include "radius.h"
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#include "radius_local.h"
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int
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radius_encrypt_mppe_key_attr(void *cipher, size_t * clen, const void *plain,
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size_t plen, const void *ra, const char *secret)
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{
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size_t slen = strlen(secret);
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uint8_t b[16], plain0[256], *p, *c;
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size_t off;
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MD5_CTX ctx;
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unsigned int i;
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uint16_t salt;
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if (plen > 239)
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return (-1);
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if (*clen < ROUNDUP(plen + 1, 16) + 2)
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return (-1);
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salt = arc4random();
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plain0[0] = plen;
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memcpy(plain0 + 1, plain, plen);
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memset(plain0 + 1 + plen, 0, ROUNDUP(plen + 1, 16) - (plen + 1));
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*clen = ROUNDUP(plen + 1, 16) + 2;
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memcpy(cipher, &salt, 2);
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for (off = 0; off < *clen - 2; off += 16) {
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c = ((uint8_t *)cipher) + 2 + off;
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p = ((uint8_t *)plain0) + off;
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MD5_Init(&ctx);
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MD5_Update(&ctx, secret, slen);
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if (off == 0) {
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MD5_Update(&ctx, ra, 16);
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MD5_Update(&ctx, cipher, 2);
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} else
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MD5_Update(&ctx, c - 16, 16);
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MD5_Final(b, &ctx);
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for (i = 0; i < 16; i++)
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c[i] = p[i] ^ b[i];
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}
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return (0);
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}
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int
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radius_decrypt_mppe_key_attr(void *plain, size_t * plen, const void *cipher,
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size_t clen, const void *ra, const char *secret)
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{
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size_t slen = strlen(secret);
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uint8_t b[16], plain0[256], *p, *c;
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size_t off;
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MD5_CTX ctx;
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unsigned int i;
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if (clen < 18 || clen > 255)
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return (-1);
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if ((clen - 2) % 16 != 0)
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return (-1);
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if (*plen < clen - 3)
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return (-1);
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for (off = 0; off < clen - 2; off += 16) {
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c = ((uint8_t *)cipher) + 2 + off;
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p = ((uint8_t *)plain0) + off;
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MD5_Init(&ctx);
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MD5_Update(&ctx, secret, slen);
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if (off == 0) {
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MD5_Update(&ctx, ra, 16);
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MD5_Update(&ctx, cipher, 2);
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} else
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MD5_Update(&ctx, c - 16, 16);
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MD5_Final(b, &ctx);
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for (i = 0; i < 16; i++)
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p[i] = c[i] ^ b[i];
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}
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if (plain0[0] > clen - 3)
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return (-1);
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*plen = plain0[0];
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memcpy(plain, plain0 + 1, *plen);
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return (0);
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}
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static int
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radius_get_mppe_key_attr(const RADIUS_PACKET * packet, uint8_t vtype,
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void *buf, size_t * len, const char *secret)
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{
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uint8_t cipher[256];
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size_t clen = sizeof(cipher);
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if (radius_get_vs_raw_attr(packet, RADIUS_VENDOR_MICROSOFT, vtype,
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cipher, &clen) != 0)
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return (-1);
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if (radius_decrypt_mppe_key_attr(buf, len, cipher, clen,
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radius_get_request_authenticator_retval(packet), secret) != 0)
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return (-1);
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return (0);
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}
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static int
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radius_put_mppe_key_attr(RADIUS_PACKET * packet, uint8_t vtype,
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const void *buf, size_t len, const char *secret)
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{
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uint8_t cipher[256];
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size_t clen = sizeof(cipher);
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if (radius_encrypt_mppe_key_attr(cipher, &clen, buf, len,
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radius_get_request_authenticator_retval(packet), secret) != 0)
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return (-1);
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if (radius_put_vs_raw_attr(packet, RADIUS_VENDOR_MICROSOFT, vtype,
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cipher, clen) != 0)
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return (-1);
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return (0);
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}
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int
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radius_get_mppe_send_key_attr(const RADIUS_PACKET * packet, void *buf,
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size_t * len, const char *secret)
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{
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return (radius_get_mppe_key_attr(packet, RADIUS_VTYPE_MPPE_SEND_KEY,
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buf, len, secret));
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}
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int
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radius_put_mppe_send_key_attr(RADIUS_PACKET * packet, const void *buf,
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size_t len, const char *secret)
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{
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return (radius_put_mppe_key_attr(packet, RADIUS_VTYPE_MPPE_SEND_KEY,
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buf, len, secret));
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}
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int
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radius_get_mppe_recv_key_attr(const RADIUS_PACKET * packet, void *buf,
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size_t * len, const char *secret)
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{
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return (radius_get_mppe_key_attr(packet, RADIUS_VTYPE_MPPE_RECV_KEY,
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buf, len, secret));
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}
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int
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radius_put_mppe_recv_key_attr(RADIUS_PACKET * packet, const void *buf,
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size_t len, const char *secret)
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{
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return (radius_put_mppe_key_attr(packet, RADIUS_VTYPE_MPPE_RECV_KEY,
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buf, len, secret));
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}
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