453 lines
11 KiB
C
453 lines
11 KiB
C
/* IKE modular algorithm handling interface
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* Copyright (C) JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>
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* Copyright (C) 2009 Andreas Steffen - Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/queue.h>
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#include <freeswan.h>
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#include <library.h>
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#include <debug.h>
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#include <credentials/keys/public_key.h>
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#include <credentials/keys/private_key.h>
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#include <crypto/hashers/hasher.h>
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#include <crypto/crypters/crypter.h>
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#include <crypto/prfs/prf.h>
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#include "constants.h"
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#include "defs.h"
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#include "crypto.h"
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#include "state.h"
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#include "packet.h"
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#include "keys.h"
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#include "log.h"
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#include "whack.h"
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#include "spdb.h"
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#include "alg_info.h"
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#include "ike_alg.h"
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#include "db_ops.h"
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#include "connections.h"
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#include "kernel.h"
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#define return_on(var, val) do { var=val;goto return_out; } while(0);
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/**
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* IKE algorithm list handling - registration and lookup
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*/
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/* Modular IKE algorithm storage structure */
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static struct ike_alg *ike_alg_base[IKE_ALG_MAX+1] = {NULL, NULL};
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/**
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* Return ike_algo object by {type, id}
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*/
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static struct ike_alg *ike_alg_find(u_int algo_type, u_int algo_id,
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u_int keysize __attribute__((unused)))
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{
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struct ike_alg *e = ike_alg_base[algo_type];
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while (e != NULL && algo_id > e->algo_id)
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{
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e = e->algo_next;
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}
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return (e != NULL && e->algo_id == algo_id) ? e : NULL;
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}
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/**
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* "raw" ike_alg list adding function
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*/
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int ike_alg_add(struct ike_alg* a, const char *plugin_name)
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{
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if (a->algo_type > IKE_ALG_MAX)
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{
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plog("ike_alg: Not added, invalid algorithm type");
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return -EINVAL;
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}
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if (ike_alg_find(a->algo_type, a->algo_id, 0) != NULL)
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{
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plog("ike_alg: Not added, algorithm already exists");
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return -EEXIST;
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}
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{
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struct ike_alg **ep = &ike_alg_base[a->algo_type];
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struct ike_alg *e = *ep;
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while (e != NULL && a->algo_id > e->algo_id)
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{
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ep = &e->algo_next;
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e = *ep;
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}
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*ep = a;
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a->plugin_name = plugin_name;
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a->algo_next = e;
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return 0;
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}
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}
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/**
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* Get IKE hash algorithm
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*/
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struct hash_desc *ike_alg_get_hasher(u_int alg)
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{
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return (struct hash_desc *) ike_alg_find(IKE_ALG_HASH, alg, 0);
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}
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/**
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* Get IKE encryption algorithm
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*/
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struct encrypt_desc *ike_alg_get_crypter(u_int alg)
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{
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return (struct encrypt_desc *) ike_alg_find(IKE_ALG_ENCRYPT, alg, 0);
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}
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/**
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* Get IKE dh group
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*/
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struct dh_desc *ike_alg_get_dh_group(u_int alg)
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{
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return (struct dh_desc *) ike_alg_find(IKE_ALG_DH_GROUP, alg, 0);
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}
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/**
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* Get pfsgroup for this connection
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*/
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const struct dh_desc *ike_alg_pfsgroup(connection_t *c, lset_t policy)
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{
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const struct dh_desc *ret = NULL;
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if ((policy & POLICY_PFS) &&
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c->alg_info_esp && c->alg_info_esp->esp_pfsgroup)
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{
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ret = ike_alg_get_dh_group(c->alg_info_esp->esp_pfsgroup);
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}
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return ret;
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}
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/**
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* Create an OAKLEY proposal based on alg_info and policy
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*/
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struct db_context *ike_alg_db_new(connection_t *c, lset_t policy)
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{
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struct alg_info_ike *ai = c->alg_info_ike;
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struct db_context *db_ctx = NULL;
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struct ike_info *ike_info;
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u_int ealg, halg, modp, eklen = 0;
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int i;
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bool is_xauth_server = (policy & POLICY_XAUTH_SERVER) != LEMPTY;
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if (!ai)
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{
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whack_log(RC_LOG_SERIOUS, "no IKE algorithms "
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"for this connection "
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"(check ike algorithm string)");
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goto fail;
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}
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policy &= POLICY_ID_AUTH_MASK;
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db_ctx = db_prop_new(PROTO_ISAKMP, 8, 8 * 5);
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/* for each group */
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ALG_INFO_IKE_FOREACH(ai, ike_info, i)
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{
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ealg = ike_info->ike_ealg;
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halg = ike_info->ike_halg;
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modp = ike_info->ike_modp;
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eklen= ike_info->ike_eklen;
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if (!ike_alg_get_crypter(ealg))
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{
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plog("ike alg: crypter %s not present",
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enum_show(&oakley_enc_names, ealg));
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continue;
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}
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if (!ike_alg_get_hasher(halg))
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{
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plog("ike alg: hasher %s not present",
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enum_show(&oakley_hash_names, halg));
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continue;
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}
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if (!ike_alg_get_dh_group(modp))
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{
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plog("ike alg: dh group %s not present",
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enum_show(&oakley_group_names, modp));
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continue;
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}
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if (policy & POLICY_PUBKEY)
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{
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int auth_method = 0, key_size = 0;
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key_type_t key_type = KEY_ANY;
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if (c->spd.this.cert)
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{
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certificate_t *certificate = c->spd.this.cert->cert;
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public_key_t *key = certificate->get_public_key(certificate);
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if (key == NULL)
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{
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plog("ike alg: unable to retrieve my public key");
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continue;
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}
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key_type = key->get_type(key);
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key_size = key->get_keysize(key);
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key->destroy(key);
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}
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else
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{
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private_key_t *key = get_private_key(c);
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if (key == NULL)
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{
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plog("ike alg: unable to retrieve my private key");
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continue;
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}
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key_type = key->get_type(key);
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key_size = key->get_keysize(key);
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}
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switch (key_type)
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{
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case KEY_RSA:
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auth_method = OAKLEY_RSA_SIG;
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break;
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case KEY_ECDSA:
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switch (key_size)
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{
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case 256:
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auth_method = OAKLEY_ECDSA_256;
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break;
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case 384:
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auth_method = OAKLEY_ECDSA_384;
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break;
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case 521:
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auth_method = OAKLEY_ECDSA_521;
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break;
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default:
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continue;
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}
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break;
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default:
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continue;
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}
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db_trans_add(db_ctx, KEY_IKE);
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db_attr_add_values(db_ctx, OAKLEY_ENCRYPTION_ALGORITHM, ealg);
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db_attr_add_values(db_ctx, OAKLEY_HASH_ALGORITHM, halg);
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if (eklen)
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{
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db_attr_add_values(db_ctx, OAKLEY_KEY_LENGTH, eklen);
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}
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db_attr_add_values(db_ctx, OAKLEY_AUTHENTICATION_METHOD, auth_method);
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db_attr_add_values(db_ctx, OAKLEY_GROUP_DESCRIPTION, modp);
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}
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if (policy & POLICY_PSK)
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{
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db_trans_add(db_ctx, KEY_IKE);
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db_attr_add_values(db_ctx, OAKLEY_ENCRYPTION_ALGORITHM, ealg);
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db_attr_add_values(db_ctx, OAKLEY_HASH_ALGORITHM, halg);
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if (eklen)
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{
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db_attr_add_values(db_ctx, OAKLEY_KEY_LENGTH, eklen);
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}
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db_attr_add_values(db_ctx, OAKLEY_AUTHENTICATION_METHOD, OAKLEY_PRESHARED_KEY);
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db_attr_add_values(db_ctx, OAKLEY_GROUP_DESCRIPTION, modp);
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}
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if (policy & POLICY_XAUTH_RSASIG)
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{
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db_trans_add(db_ctx, KEY_IKE);
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db_attr_add_values(db_ctx, OAKLEY_ENCRYPTION_ALGORITHM, ealg);
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db_attr_add_values(db_ctx, OAKLEY_HASH_ALGORITHM, halg);
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if (eklen)
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{
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db_attr_add_values(db_ctx, OAKLEY_KEY_LENGTH, eklen);
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}
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db_attr_add_values(db_ctx, OAKLEY_AUTHENTICATION_METHOD
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, is_xauth_server ? XAUTHRespRSA : XAUTHInitRSA);
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db_attr_add_values(db_ctx, OAKLEY_GROUP_DESCRIPTION, modp);
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}
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if (policy & POLICY_XAUTH_PSK)
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{
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db_trans_add(db_ctx, KEY_IKE);
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db_attr_add_values(db_ctx, OAKLEY_ENCRYPTION_ALGORITHM, ealg);
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db_attr_add_values(db_ctx, OAKLEY_HASH_ALGORITHM, halg);
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if (eklen)
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{
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db_attr_add_values(db_ctx, OAKLEY_KEY_LENGTH, eklen);
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}
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db_attr_add_values(db_ctx, OAKLEY_AUTHENTICATION_METHOD
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, is_xauth_server ? XAUTHRespPreShared : XAUTHInitPreShared);
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db_attr_add_values(db_ctx, OAKLEY_GROUP_DESCRIPTION, modp);
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}
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}
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fail:
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return db_ctx;
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}
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/**
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* Print the name of an algorithm plus the name of the plugin that registered it
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*/
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static void print_alg(char *buf, int *len, enum_names *alg_names, int alg_type,
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const char *plugin_name)
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{
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char alg_name[BUF_LEN];
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int alg_name_len;
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alg_name_len = sprintf(alg_name, " %s[%s]", enum_name(alg_names, alg_type),
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plugin_name);
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if (*len + alg_name_len > CRYPTO_MAX_ALG_LINE)
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{
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whack_log(RC_COMMENT, "%s", buf);
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*len = sprintf(buf, " ");
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}
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sprintf(buf + *len, "%s", alg_name);
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*len += alg_name_len;
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}
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/**
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* Show registered IKE algorithms
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*/
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void ike_alg_list(void)
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{
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rng_quality_t quality;
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enumerator_t *enumerator;
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const char *plugin_name;
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char buf[BUF_LEN];
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int len;
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struct ike_alg *a;
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whack_log(RC_COMMENT, " ");
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whack_log(RC_COMMENT, "List of registered IKEv1 Algorithms:");
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whack_log(RC_COMMENT, " ");
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len = sprintf(buf, " encryption:");
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for (a = ike_alg_base[IKE_ALG_ENCRYPT]; a != NULL; a = a->algo_next)
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{
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print_alg(buf, &len, &oakley_enc_names, a->algo_id, a->plugin_name);
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}
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whack_log(RC_COMMENT, "%s", buf);
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len = sprintf(buf, " integrity: ");
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for (a = ike_alg_base[IKE_ALG_HASH]; a != NULL; a = a->algo_next)
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{
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print_alg(buf, &len, &oakley_hash_names, a->algo_id, a->plugin_name);
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}
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whack_log(RC_COMMENT, "%s", buf);
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len = sprintf(buf, " dh-group: ");
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for (a = ike_alg_base[IKE_ALG_DH_GROUP]; a != NULL; a = a->algo_next)
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{
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print_alg(buf, &len, &oakley_group_names, a->algo_id, a->plugin_name);
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}
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whack_log(RC_COMMENT, "%s", buf);
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len = sprintf(buf, " random-gen:");
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enumerator = lib->crypto->create_rng_enumerator(lib->crypto);
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while (enumerator->enumerate(enumerator, &quality, &plugin_name))
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{
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len += sprintf(buf + len, " %N[%s]", rng_quality_names, quality,
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plugin_name);
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}
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enumerator->destroy(enumerator);
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whack_log(RC_COMMENT, "%s", buf);
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}
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/**
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* Show IKE algorithms for this connection (result from ike= string)
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* and newest SA
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*/
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void ike_alg_show_connection(connection_t *c, const char *instance)
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{
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struct state *st = state_with_serialno(c->newest_isakmp_sa);
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if (st)
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{
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if (st->st_oakley.encrypt == OAKLEY_3DES_CBC)
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{
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whack_log(RC_COMMENT,
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"\"%s\"%s: IKE proposal: %s/%s/%s",
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c->name, instance,
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enum_show(&oakley_enc_names, st->st_oakley.encrypt),
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enum_show(&oakley_hash_names, st->st_oakley.hash),
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enum_show(&oakley_group_names, st->st_oakley.group->algo_id)
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);
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}
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else
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{
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whack_log(RC_COMMENT,
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"\"%s\"%s: IKE proposal: %s_%u/%s/%s",
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c->name, instance,
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enum_show(&oakley_enc_names, st->st_oakley.encrypt),
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st->st_oakley.enckeylen,
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enum_show(&oakley_hash_names, st->st_oakley.hash),
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enum_show(&oakley_group_names, st->st_oakley.group->algo_id)
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);
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}
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}
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}
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/**
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* ML: make F_STRICT logic consider enc,hash/auth,modp algorithms
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*/
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bool ike_alg_ok_final(u_int ealg, u_int key_len, u_int aalg, u_int group,
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struct alg_info_ike *alg_info_ike)
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{
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/*
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* simple test to discard low key_len, will accept it only
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* if specified in "esp" string
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*/
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bool ealg_insecure = (key_len < 128);
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if (ealg_insecure
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|| (alg_info_ike && alg_info_ike->alg_info_flags & ALG_INFO_F_STRICT))
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{
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int i;
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struct ike_info *ike_info;
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if (alg_info_ike)
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{
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ALG_INFO_IKE_FOREACH(alg_info_ike, ike_info, i)
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{
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if (ike_info->ike_ealg == ealg
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&& (ike_info->ike_eklen == 0 || key_len == 0 || ike_info->ike_eklen == key_len)
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&& ike_info->ike_halg == aalg
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&& ike_info->ike_modp == group)
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{
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if (ealg_insecure)
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loglog(RC_LOG_SERIOUS, "You should NOT use insecure IKE algorithms (%s)!"
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, enum_name(&oakley_enc_names, ealg));
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return TRUE;
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}
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}
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}
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plog("Oakley Transform [%s (%d), %s, %s] refused due to %s"
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, enum_name(&oakley_enc_names, ealg), key_len
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, enum_name(&oakley_hash_names, aalg)
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, enum_name(&oakley_group_names, group)
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, ealg_insecure ?
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"insecure key_len and enc. alg. not listed in \"ike\" string" : "strict flag"
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);
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return FALSE;
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}
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return TRUE;
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}
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