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/*
* Copyright 1997,1998 Niels Provos <provos@physnet.uni-hamburg.de>
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Niels Provos.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
/*
* photuris_identity_response:
* create a IDENTITY_RESPONSE packet; return -1 on failure, 0 on success
*
*/
#ifndef lint
static char rcsid[] = "$Id: photuris_identity_response.c,v 1.1 1998/11/14 23:37:26 deraadt Exp $";
#endif
#include <stdio.h>
#include <string.h>
#include "config.h"
#include "photuris.h"
#include "packets.h"
#include "state.h"
#include "identity.h"
#include "encrypt.h"
#ifdef DEBUG
#include "packet.h"
#endif
int
photuris_identity_response(struct stateob *st, u_char *buffer, int *size)
{
struct identity_message *header;
u_int16_t rsize, asize, tmp;
u_int8_t *p, *verifyp;
rsize = *size;
if (rsize < IDENTITY_MESSAGE_MIN)
return -1; /* buffer not large enough */
asize = IDENTITY_MESSAGE_MIN; /* Actual size */
rsize -= asize; /* Remaining size */
header = (struct identity_message *) buffer;
header->type = IDENTITY_RESPONSE;
/* Copy the cookies */
bcopy(st->icookie, header->icookie, COOKIE_SIZE);
bcopy(st->rcookie, header->rcookie, COOKIE_SIZE);
header->lifetime[0] = (st->olifetime >> 16) & 0xFF;
header->lifetime[1] = (st->olifetime >> 8) & 0xFF;
header->lifetime[2] = st->olifetime & 0xFF;
bcopy(st->oSPI, header->SPI, SPI_SIZE );
/* Choose identity parameters (choice + value) */
p = IDENTITY_MESSAGE_CHOICE(header); /* To Identity choice */
tmp = rsize; /* Remaining size */
/* Choose and Copy choice */
if (choose_identity(st, p, &tmp, st->uSPIoattrib,
st->uSPIoattribsize) == -1 )
return -1;
p += tmp; asize += tmp; rsize -= tmp;
verifyp = p;
/* Leave space for verification data */
tmp = get_identity_verification_size(st, IDENTITY_MESSAGE_CHOICE(header));
if (rsize < tmp)
return -1; /* buffer not large enough */
/* Zero the buffer, so we can hash over it */
bzero(verifyp, tmp);
p += tmp; asize += tmp; rsize -= tmp;
if (rsize < st->oSPIattribsize)
return -1; /* buffer not large enough */
/* Copy attributes and padding */
bcopy(st->oSPIattrib, p, st->oSPIattribsize);
asize += st->oSPIattribsize;
rsize -= st->oSPIattribsize;
p += st->oSPIattribsize;
tmp = rsize;
if(packet_create_padding(st, asize - IDENTITY_MESSAGE_MIN,
p, &tmp) == -1)
return -1;
p += tmp; asize += tmp; rsize -= tmp;
/* Create verification data */
create_identity_verification(st, verifyp, (u_int8_t *)header, asize);
#ifdef DEBUG2
printf("Identity-Response (before encryption):\n");
packet_dump((u_int8_t *)header, asize, 0);
#endif
/* Encrypt the packet after SPI if wished for */
packet_encrypt(st, IDENTITY_MESSAGE_CHOICE(header),
asize - IDENTITY_MESSAGE_MIN);
*size = asize;
return 0;
}
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