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/* IKEv1 message contents, for libreswan
*
* Copyright (C) 2019 Andrew Cagney
*
* 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 "shunk.h"
#include "id.h"
#include "connections.h"
#include "packet.h"
#include "ikev1_message.h"
#include "diag.h"
#include "lswlog.h"
#include "unpack.h"
#include "demux.h"
#include "crypt_ke.h"
struct isakmp_ipsec_id build_v1_id_payload(const struct end *end, shunk_t *body)
{
struct isakmp_ipsec_id id_hd = {
.isaiid_idtype = id_to_payload(&end->id, &end->host_addr, body),
};
return id_hd;
}
bool out_zero(size_t len, pb_stream *outs, const char *name)
{
diag_t d = pbs_out_zero(outs, len, name);
if (d != NULL) {
log_diag(RC_LOG_SERIOUS, outs->outs_logger, &d, "%s", "");
return false;
}
return true;
}
bool out_repeated_byte(uint8_t byte, size_t len, pb_stream *outs, const char *name)
{
diag_t d = pbs_out_repeated_byte(outs, byte, len, name);
if (d != NULL) {
log_diag(RC_LOG_SERIOUS, outs->outs_logger, &d, "%s", "");
return false;
}
return true;
}
bool out_raw(const void *bytes, size_t len, pb_stream *outs, const char *name)
{
diag_t d = pbs_out_raw(outs, bytes, len, name);
if (d != NULL) {
log_diag(RC_LOG_SERIOUS, outs->outs_logger, &d, "%s", "");
return false;
}
return true;
}
bool ikev1_justship_nonce(chunk_t *n, struct pbs_out *outs,
const char *name)
{
return ikev1_out_generic_chunk(&isakmp_nonce_desc, outs, *n, name);
}
bool ikev1_ship_nonce(chunk_t *n, chunk_t *nonce,
struct pbs_out *outs, const char *name)
{
unpack_nonce(n, nonce);
return ikev1_justship_nonce(n, outs, name);
}
notification_t accept_v1_nonce(struct logger *logger,
struct msg_digest *md, chunk_t *dest,
const char *name)
{
pb_stream *nonce_pbs = &md->chain[ISAKMP_NEXT_NONCE]->pbs;
size_t len = pbs_left(nonce_pbs);
if (len < IKEv1_MINIMUM_NONCE_SIZE || IKEv1_MAXIMUM_NONCE_SIZE < len) {
llog(RC_LOG_SERIOUS, logger, "%s length not between %d and %d",
name, IKEv1_MINIMUM_NONCE_SIZE, IKEv1_MAXIMUM_NONCE_SIZE);
return PAYLOAD_MALFORMED; /* ??? */
}
free_chunk_content(dest);
*dest = clone_hunk(pbs_in_left_as_shunk(nonce_pbs), "nonce");
passert(len == dest->len);
return NOTHING_WRONG;
}
/*
* package up the calculate KE value, and emit it as a KE payload.
* used by IKEv1: main, aggressive, and quick (in PFS mode).
*/
bool ikev1_justship_KE(struct logger *logger, chunk_t *g, pb_stream *outs)
{
switch (impair.ke_payload) {
case IMPAIR_EMIT_NO:
return ikev1_out_generic_chunk(&isakmp_keyex_desc, outs, *g,
"keyex value");
case IMPAIR_EMIT_OMIT:
llog(RC_LOG, logger, "IMPAIR: sending no KE (g^x) payload");
return true;
case IMPAIR_EMIT_EMPTY:
llog(RC_LOG, logger, "IMPAIR: sending empty KE (g^x)");
return ikev1_out_generic_chunk(&isakmp_keyex_desc, outs,
EMPTY_CHUNK, "empty KE");
case IMPAIR_EMIT_ROOF:
default:
{
pb_stream z;
uint8_t byte = impair.ke_payload - IMPAIR_EMIT_ROOF;
llog(RC_LOG, logger, "IMPAIR: sending bogus KE (g^x) == %u value to break DH calculations", byte);
/* Only used to test sending/receiving bogus g^x */
return ikev1_out_generic(&isakmp_keyex_desc, outs, &z) &&
out_repeated_byte(byte, g->len, &z, "fake g^x") &&
(close_output_pbs(&z), TRUE);
}
}
}
bool ikev1_ship_KE(struct state *st, struct dh_local_secret *local_secret,
chunk_t *g, struct pbs_out *outs)
{
unpack_KE_from_helper(st, local_secret, g);
return ikev1_justship_KE(st->st_logger, g, outs);
}
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