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/*
* Cryptographic helper function - calculate KE and nonce
* Copyright (C) 2004 Michael C. Richardson <mcr@xelerance.com>
* Copyright (C) 2009 - 2012 Avesh Agarwal <avagarwa@redhat.com>
* Copyright (C) 2009 Paul Wouters <paul@xelerance.com>
* Copyright (C) 2012 Paul Wouters <paul@libreswan.org>
* Copyright (C) 2017 Andrew Cagney <cagney@gnu.org>
*
* 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.
*
* This code was developed with the support of IXIA communications.
*
*/
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <signal.h>
#include "sysdep.h"
#include "constants.h"
#include "defs.h"
#include "demux.h"
#include "crypto.h"
#include "rnd.h"
#include "state.h"
#include "server_pool.h"
#include "log.h"
#include <nspr.h>
#include <prerror.h>
#include <pk11pub.h>
#include <keyhi.h>
#include "lswnss.h"
#include "test_buffer.h"
#include "ike_alg.h"
#include "crypt_dh.h"
#include "crypt_ke.h"
struct task {
const struct dh_desc *dh;
chunk_t nonce;
struct dh_local_secret *local_secret;
ke_and_nonce_cb *cb;
};
static void compute_ke_and_nonce(struct logger *logger,
struct task *task,
int thread_unused UNUSED)
{
if (task->dh != NULL) {
task->local_secret = calc_dh_local_secret(task->dh, logger);
if (DBGP(DBG_CRYPT)) {
DBG_log("NSS: Local DH %s secret (pointer): %p",
task->dh->common.fqn, task->local_secret);
}
}
task->nonce = alloc_rnd_chunk(DEFAULT_NONCE_SIZE, "nonce");
if (DBGP(DBG_CRYPT)) {
DBG_dump_hunk("Generated nonce:", task->nonce);
}
}
static void cleanup_ke_and_nonce(struct task **task)
{
dh_local_secret_delref(&(*task)->local_secret, HERE);
free_chunk_content(&(*task)->nonce);
pfreeany(*task);
}
static stf_status complete_ke_and_nonce(struct state *st,
struct msg_digest *md,
struct task *task)
{
stf_status status = task->cb(st, md,
task->local_secret,
&task->nonce);
return status;
}
static const struct task_handler ke_and_nonce_handler = {
.name = "dh",
.cleanup_cb = cleanup_ke_and_nonce,
.computer_fn = compute_ke_and_nonce,
.completed_cb = complete_ke_and_nonce,
};
void submit_ke_and_nonce(struct state *callback_sa,
struct state *task_sa,
struct msg_digest *md,
const struct dh_desc *dh,
ke_and_nonce_cb *cb,
bool detach_whack,
where_t where)
{
struct task *task = alloc_thing(struct task, "dh");
task->dh = dh;
task->cb = cb;
submit_task(/*callback*/callback_sa, /*task*/task_sa, md, detach_whack,
task, &ke_and_nonce_handler, where);
}
/*
* Process KE values.
*/
void unpack_KE_from_helper(struct state *st, struct dh_local_secret *local_secret,
chunk_t *g)
{
/*
* Should the crypto helper group and the state group be in
* sync?
*
* Probably not, yet seemingly (IKEv2) code is assuming this.
*
* For instance, with IKEv2, the initial initiator is setting
* st_oakley.group to the draft KE group (and well before
* initial responder has had a chance to agree to any thing).
* Should the initial responder comes back with INVALID_KE
* then st_oakley.group gets changed to match the suggestion
* and things restart; should the initial responder come back
* with an accepted proposal and KE, then the st_oakley.group
* is set based on the accepted proposal (the two are
* checked).
*
* Surely, instead, st_oakley.group should be left alone. The
* the initial initiator would maintain a list of KE values
* proposed (INVALID_KE flip-flopping can lead to more than
* one) and only set st_oakley.group when the initial
* responder comes back with a vald accepted propsal and KE.
*/
if (DBGP(DBG_CRYPT)) {
const struct dh_desc *group = dh_local_secret_desc(local_secret);
DBG_log("wire (crypto helper) group %s and state group %s %s",
group->common.fqn,
st->st_oakley.ta_dh ? st->st_oakley.ta_dh->common.fqn : "NULL",
group == st->st_oakley.ta_dh ? "match" : "differ");
}
replace_chunk(g, dh_local_secret_ke(local_secret), "KE");
pexpect(st->st_dh_local_secret == NULL);
st->st_dh_local_secret = dh_local_secret_addref(local_secret, HERE);
}
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