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/* ESP parsing and creation functions, for libreswan
*
* Author: JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>
*
* Copyright (C) 2012 Paul Wouters <paul@libreswan.org>
* Copyright (C) 2015-2019 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.
*/
#include <stdio.h>
#include <stdint.h>
#include <limits.h>
#include "lswalloc.h"
#include "lswlog.h"
#include "proposals.h"
#include "alg_byname.h"
#include "fips_mode.h"
#include "ike_alg.h"
#include "ike_alg_encrypt.h"
#include "ike_alg_integ.h"
/*
* Add ESP alg info _with_ logic (policy):
*/
static bool esp_proposal_ok(struct proposal_parser *parser,
const struct proposal *proposal)
{
if (!proposal_aead_none_ok(parser, proposal)) {
if (!impair_proposal_errors(parser)) {
return false;
}
}
impaired_passert(proposal_parser, parser->policy->logger,
next_algorithm(proposal, PROPOSAL_encrypt, NULL) != NULL);
impaired_passert(proposal_parser, parser->policy->logger,
next_algorithm(proposal, PROPOSAL_prf, NULL) == NULL);
impaired_passert(proposal_parser, parser->policy->logger,
next_algorithm(proposal, PROPOSAL_integ, NULL) != NULL);
return true;
}
/*
* IKEv1:
*
* since esp= must have an encryption algorithm this is normally
* ignored.
*/
static const char default_ikev1_esp_proposals[] =
"AES_CBC" /*????*/
","
"AES_GCM_16_128"
","
"AES_GCM_16_256"
","
"3DES"
;
static const struct ike_alg *default_ikev1_esp_integ[] = {
#ifdef USE_SHA1
&ike_alg_integ_sha1.common,
#endif
#ifdef USE_SHA2
&ike_alg_integ_sha2_512.common,
&ike_alg_integ_sha2_256.common,
#endif
NULL,
};
static const struct proposal_defaults ikev1_esp_defaults = {
.proposals[FIPS_MODE_OFF] = default_ikev1_esp_proposals,
.proposals[FIPS_MODE_ON] = default_ikev1_esp_proposals,
.integ = default_ikev1_esp_integ,
};
/*
* IKEv2:
*/
static const char default_fips_on_ikev2_esp_proposals[] =
"AES_GCM_16_256"
","
"AES_GCM_16_128"
","
"AES_CBC_256"
","
"AES_CBC_128"
;
static const char default_fips_off_ikev2_esp_proposals[] =
"AES_GCM_16_256"
","
"AES_GCM_16_128"
#ifdef USE_CHACHA
","
"CHACHA20_POLY1305" /*non-FIPS*/
#endif
","
"AES_CBC_256"
","
"AES_CBC_128"
;
static const struct ike_alg *default_ikev2_esp_integ[] = {
#ifdef USE_SHA2
&ike_alg_integ_sha2_512.common,
&ike_alg_integ_sha2_256.common,
#endif
NULL,
};
static const struct proposal_defaults ikev2_esp_defaults = {
.proposals[FIPS_MODE_ON] = default_fips_on_ikev2_esp_proposals,
.proposals[FIPS_MODE_OFF] = default_fips_off_ikev2_esp_proposals,
.integ = default_ikev2_esp_integ,
};
/*
* All together now ...
*/
static const struct proposal_protocol ikev1_esp_proposal_protocol = {
.name = "ESP",
.alg_id = IKEv1_IPSEC_ID,
.defaults = &ikev1_esp_defaults,
.proposal_ok = esp_proposal_ok,
.encrypt = true,
.integ = true,
.dh = true,
};
static const struct proposal_protocol ikev2_esp_proposal_protocol = {
.name = "ESP",
.alg_id = IKEv2_ALG_ID,
.defaults = &ikev2_esp_defaults,
.proposal_ok = esp_proposal_ok,
.encrypt = true,
.integ = true,
.dh = true,
};
static const struct proposal_protocol *esp_proposal_protocol[] = {
[IKEv1] = &ikev1_esp_proposal_protocol,
[IKEv2] = &ikev2_esp_proposal_protocol,
};
/*
* ??? the only difference between
* alg_info_ah_create_from_str and esp_proposals_create_from_str
* is in the second argument to proposal_parser.
*
* XXX: On the other hand, since "struct ike_info" and "struct
* esp_info" are effectively the same, they can be merged. Doing
* that, would eliminate the AH using ESP confusion.
*/
/* This function is tested in testing/algparse/algparse.c */
struct proposal_parser *esp_proposal_parser(const struct proposal_policy *policy)
{
return alloc_proposal_parser(policy, esp_proposal_protocol[policy->version]);
}
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