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/*
* challenge.h
* ptunnel is licensed under the BSD license:
*
* Copyright (c) 2004-2011, Daniel Stoedle <daniels@cs.uit.no>,
* Yellow Lemon Software. All rights reserved.
*
* Copyright (c) 2017-2019, Toni Uhlig <matzeton@googlemail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - 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.
*
* - Neither the name of the Yellow Lemon Software nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*
* Contacting the author:
* You can get in touch with me, Daniel Stødle (that's the Norwegian letter oe,
* in case your text editor didn't realize), here: <daniels@cs.uit.no>
*
* The official ptunnel website is here:
* <http://www.cs.uit.no/~daniels/PingTunnel/>
*
* Note that the source code is best viewed with tabs set to 4 spaces.
*/
#ifndef CHALLENGE_H
#define CHALLENGE_H 1
#include "pconfig.h"
#include <stdint.h>
#ifdef ENABLE_SHA512
#include <openssl/sha.h>
#endif
#define HT_MD5 0x1
#define HT_SHA512 0x2
typedef struct challenge_plain_t {
/** tv_sec as returned by gettimeofday */
uint32_t sec;
/** tv_usec as returned by gettimeofday + random value */
uint32_t usec_rnd;
/** random values */
uint32_t random[6];
} __attribute__ ((packed)) challenge_plain_t;
typedef struct challenge_digest_t {
uint8_t hash_type;
union {
unsigned char md5[kMD5_digest_size];
unsigned char sha512[kSHA512_digest_size];
};
} __attribute__ ((packed)) challenge_digest_t;
/** challenge_t: This structure contains the pseudo-random challenge used for
* authentication. If OpenSSL is available SHA512 will be used per default.
*/
typedef struct challenge_t {
challenge_plain_t plain;
challenge_digest_t digest;
} __attribute__ ((packed)) challenge_t;
challenge_t *generate_challenge(void);
void generate_response_md5(challenge_plain_t *plain, challenge_digest_t *digest);
int validate_challenge_md5(challenge_t *local, challenge_digest_t *remote);
#ifdef ENABLE_SHA512
void generate_response_sha512(challenge_plain_t *plain, challenge_digest_t *digest);
int validate_challenge_sha512(challenge_t *local, challenge_digest_t *remote);
#endif
#endif
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