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/*
* Copyright 1997-2000 Niels Provos <provos@citi.umich.edu>
* 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.
*/
/*
* handle_spi_needed:
* receive a SPI_NEEDED packet; return -1 on failure, 0 on success
*
*/
#ifndef lint
static char rcsid[] = "$Id: handle_spi_needed.c,v 1.4 2000/12/15 02:50:38 provos Exp $";
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "photuris.h"
#include "packets.h"
#include "state.h"
#include "cookie.h"
#include "buffer.h"
#include "packet.h"
#include "encrypt.h"
#include "validity.h"
#include "attributes.h"
#include "secrets.h"
#include "scheme.h"
#include "log.h"
#include "spi.h"
#ifdef IPSEC
#include "kernel.h"
#endif
int
handle_spi_needed(u_char *packet, int size, char *address,
char *local_address)
{
struct packet_sub parts[] = {
{ "Verification", FLD_VARPRE, 0, 0, },
{ "Attributes", FLD_ATTRIB, FMD_ATT_FILL, 0, },
{ NULL }
};
struct packet spi_msg = {
"SPI Needed",
SPI_NEEDED_MIN, 0, parts
};
struct spi_needed *header;
struct stateob *st;
struct spiob *spi;
u_int8_t *attributes;
u_int16_t i, attribsize, tmp;
u_int8_t signature[22]; /* XXX - constant */
if (size < SPI_NEEDED_MIN)
return -1; /* packet too small */
header = (struct spi_needed *) packet;
st = state_find_cookies(address, header->icookie, header->rcookie);
if (st == NULL) {
packet_size = PACKET_BUFFER_SIZE;
photuris_error_message(st, packet_buffer, &packet_size,
header->icookie, header->rcookie,
0, BAD_COOKIE);
send_packet();
return 0;
}
if (st->phase != SPI_UPDATE && st->phase != SPI_NEEDED)
return 0; /* We don't want this packet */
/* Decrypt message */
tmp = size - SPI_NEEDED_MIN;
if (packet_decrypt(st, SPI_NEEDED_VERIFICATION(header), &tmp) == -1) {
log_print("packet_decrypt() in handle_spi_needed()");
goto verification_failed;
}
/* Verify message structure*/
if (packet_check((u_int8_t *)header, size - packet[size-1], &spi_msg) == -1) {
log_print("bad packet structure in handle_spi_update()");
return -1;
}
i = get_validity_verification_size(st);
if (!i || i != parts[0].size || i > sizeof(signature)) {
log_print("verification size mismatch in handle_spi_needed()");
goto verification_failed;
}
bcopy(parts[0].where, signature, i);
attributes = parts[1].where;
attribsize = parts[1].size;
if (!isattribsubset(st->oSPIoattrib,st->oSPIoattribsize,
attributes, attribsize)) {
log_print("attributes are not a subset in handle_spi_needed()");
return 0;
}
if (!verify_validity_verification(st, signature, packet, size)) {
verification_failed:
log_print("verification failed in handle_spi_needed()");
packet_size = PACKET_BUFFER_SIZE;
photuris_error_message(st, packet_buffer, &packet_size,
header->icookie, header->rcookie,
0, VERIFICATION_FAILURE);
send_packet();
return 0;
}
if (st->uSPIoattrib != NULL)
free(st->uSPIoattrib);
if((st->uSPIoattrib = calloc(attribsize, sizeof(u_int8_t))) == NULL) {
log_error("calloc() in handle_spi_needed()");
return -1;
}
bcopy(attributes, st->uSPIoattrib, attribsize);
st->uSPIoattribsize = attribsize;
/* Delete old attributes, make_spi will make new */
if (st->oSPIattrib != NULL) {
free(st->oSPIattrib);
st->oSPIattrib = NULL;
st->oSPIattribsize = 0;
}
if (make_spi(st, local_address, st->oSPI, &(st->olifetime),
&(st->oSPIattrib), &(st->oSPIattribsize)) == -1)
return -1;
packet_size = PACKET_BUFFER_SIZE;
if (photuris_spi_update(st, packet_buffer, &packet_size) == -1) {
log_print("photuris_spi_update() in handle_spi_needed()");
return -1;
}
send_packet();
/* Insert Owner SPI */
if ((spi = spi_new(st->address, st->oSPI)) == NULL) {
log_print("spi_new() in handle_spi_needed()");
return -1;
}
if ((spi->local_address = strdup(local_address)) == NULL) {
log_error("strdup() in handle_spi_needed()");
return -1;
}
bcopy(st->icookie, spi->icookie, COOKIE_SIZE);
spi->flags |= SPI_OWNER;
spi->attribsize = st->oSPIattribsize;
spi->attributes = calloc(spi->attribsize, sizeof(u_int8_t));
if (spi->attributes == NULL) {
log_error("calloc() in handle_spi_needed()");
spi_value_reset(spi);
return -1;
}
bcopy(st->oSPIattrib, spi->attributes, spi->attribsize);
spi->lifetime = time(NULL) + st->olifetime;
make_session_keys(st, spi);
spi_insert(spi);
spi_update_insert(spi);
#ifdef IPSEC
kernel_insert_spi(st, spi);
#endif
return 0;
}
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