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/* unpack generic parts of a message, for libreswan
*
* Copyright (C) 1997 Angelos D. Keromytis.
* Copyright (C) 1998-2002,2010-2017 D. Hugh Redelmeier <hugh@mimosa.com>
* Copyright (C) 2003-2006 Michael Richardson <mcr@xelerance.com>
* Copyright (C) 2003-2011 Paul Wouters <paul@xelerance.com>
* Copyright (C) 2010-2011 Tuomo Soini <tis@foobar.fi>
* Copyright (C) 2009 Avesh Agarwal <avagarwa@redhat.com>
* Copyright (C) 2012-2018 Paul Wouters <pwouters@redhat.com>
* Copyright (C) 2013 David McCullough <ucdevel@gmail.com>
* Copyright (C) 2013 Matt Rogers <mrogers@redhat.com>
* Copyright (C) 2014-2019 Andrew Cagney <cagney@gnu.org>
* Copyright (C) 2017-2018 Antony Antony <antony@phenome.org>
* Copyright (C) 2017 Mayank Totale <mtotale@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
*/
#include "ike_alg.h"
#include "id.h"
#include "ip_info.h"
#include "defs.h" /* for so_serial_t */
#include "demux.h"
#include "unpack.h"
#include "log.h"
#include "packet.h"
/* accept_KE
*
* Check and accept DH public value (Gi or Gr) from peer's message.
* According to RFC2409 "The Internet key exchange (IKE)" 5:
* The Diffie-Hellman public value passed in a KE payload, in either
* a phase 1 or phase 2 exchange, MUST be the length of the negotiated
* Diffie-Hellman group enforced, if necessary, by prepending the
* value with zeros.
*/
bool unpack_KE(chunk_t *dest, const char *val_name,
const struct dh_desc *gr,
struct payload_digest *ke_pd,
struct logger *logger)
{
if (ke_pd == NULL) {
llog(RC_LOG, logger, "KE missing");
return false;
}
struct pbs_in *pbs = &ke_pd->pbs;
if (pbs_left(pbs) != gr->bytes) {
llog(RC_LOG, logger,
"KE has %u byte DH public value; %u required",
(unsigned) pbs_left(pbs), (unsigned) gr->bytes);
return false;
}
replace_chunk(dest, pbs_in_left(pbs), val_name);
if (DBGP(DBG_CRYPT)) {
DBG_log("DH public value received:");
DBG_dump_hunk(NULL, *dest);
}
return true;
}
void unpack_nonce(chunk_t *n, chunk_t *nonce)
{
/* steal away */
free_chunk_content(n);
*n = *nonce;
*nonce = empty_chunk;
}
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