Merge branch 'ikev1'
Conflicts: configure.in man/ipsec.conf.5.in src/libcharon/encoding/generator.c src/libcharon/encoding/payloads/notify_payload.c src/libcharon/encoding/payloads/notify_payload.h src/libcharon/encoding/payloads/payload.c src/libcharon/network/receiver.c src/libcharon/sa/authenticator.c src/libcharon/sa/authenticator.h src/libcharon/sa/ikev2/tasks/ike_init.c src/libcharon/sa/task_manager.c src/libstrongswan/credentials/auth_cfg.c
This commit is contained in:
Martin Willi
@@ -0,0 +1,590 @@
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/*
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* Copyright (C) 2008-2009 Tobias Brunner
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* Copyright (C) 2005-2008 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* 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 "ike_init.h"
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#include <string.h>
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#include <daemon.h>
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#include <sa/ikev2/keymat_v2.h>
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#include <crypto/diffie_hellman.h>
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#include <encoding/payloads/sa_payload.h>
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#include <encoding/payloads/ke_payload.h>
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#include <encoding/payloads/nonce_payload.h>
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/** maximum retries to do with cookies/other dh groups */
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#define MAX_RETRIES 5
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typedef struct private_ike_init_t private_ike_init_t;
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/**
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* Private members of a ike_init_t task.
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*/
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struct private_ike_init_t {
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/**
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* Public methods and task_t interface.
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*/
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ike_init_t public;
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/**
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* Assigned IKE_SA.
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*/
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ike_sa_t *ike_sa;
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/**
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* Are we the initiator?
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*/
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bool initiator;
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/**
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* IKE config to establish
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*/
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ike_cfg_t *config;
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/**
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* diffie hellman group to use
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*/
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diffie_hellman_group_t dh_group;
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/**
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* diffie hellman key exchange
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*/
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diffie_hellman_t *dh;
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/**
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* Keymat derivation (from IKE_SA)
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*/
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keymat_v2_t *keymat;
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/**
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* nonce chosen by us
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*/
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chunk_t my_nonce;
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/**
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* nonce chosen by peer
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*/
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chunk_t other_nonce;
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/**
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* Negotiated proposal used for IKE_SA
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*/
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proposal_t *proposal;
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/**
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* Old IKE_SA which gets rekeyed
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*/
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ike_sa_t *old_sa;
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/**
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* cookie received from responder
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*/
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chunk_t cookie;
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/**
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* retries done so far after failure (cookie or bad dh group)
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*/
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u_int retry;
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};
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/**
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* build the payloads for the message
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*/
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static void build_payloads(private_ike_init_t *this, message_t *message)
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{
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sa_payload_t *sa_payload;
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ke_payload_t *ke_payload;
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nonce_payload_t *nonce_payload;
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linked_list_t *proposal_list;
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ike_sa_id_t *id;
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proposal_t *proposal;
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enumerator_t *enumerator;
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id = this->ike_sa->get_id(this->ike_sa);
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this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
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if (this->initiator)
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{
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proposal_list = this->config->get_proposals(this->config);
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if (this->old_sa)
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{
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/* include SPI of new IKE_SA when we are rekeying */
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enumerator = proposal_list->create_enumerator(proposal_list);
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while (enumerator->enumerate(enumerator, (void**)&proposal))
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{
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proposal->set_spi(proposal, id->get_initiator_spi(id));
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}
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enumerator->destroy(enumerator);
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}
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sa_payload = sa_payload_create_from_proposals_v2(proposal_list);
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proposal_list->destroy_offset(proposal_list, offsetof(proposal_t, destroy));
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}
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else
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{
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if (this->old_sa)
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{
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/* include SPI of new IKE_SA when we are rekeying */
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this->proposal->set_spi(this->proposal, id->get_responder_spi(id));
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}
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sa_payload = sa_payload_create_from_proposal_v2(this->proposal);
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}
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message->add_payload(message, (payload_t*)sa_payload);
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nonce_payload = nonce_payload_create(NONCE);
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nonce_payload->set_nonce(nonce_payload, this->my_nonce);
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ke_payload = ke_payload_create_from_diffie_hellman(KEY_EXCHANGE, this->dh);
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if (this->old_sa)
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{ /* payload order differs if we are rekeying */
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message->add_payload(message, (payload_t*)nonce_payload);
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message->add_payload(message, (payload_t*)ke_payload);
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}
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else
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{
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message->add_payload(message, (payload_t*)ke_payload);
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message->add_payload(message, (payload_t*)nonce_payload);
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}
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}
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/**
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* Read payloads from message
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*/
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static void process_payloads(private_ike_init_t *this, message_t *message)
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{
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enumerator_t *enumerator;
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payload_t *payload;
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enumerator = message->create_payload_enumerator(message);
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while (enumerator->enumerate(enumerator, &payload))
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{
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switch (payload->get_type(payload))
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{
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case SECURITY_ASSOCIATION:
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{
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sa_payload_t *sa_payload = (sa_payload_t*)payload;
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linked_list_t *proposal_list;
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bool private;
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proposal_list = sa_payload->get_proposals(sa_payload);
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private = this->ike_sa->supports_extension(this->ike_sa,
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EXT_STRONGSWAN);
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this->proposal = this->config->select_proposal(this->config,
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proposal_list, private);
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proposal_list->destroy_offset(proposal_list,
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offsetof(proposal_t, destroy));
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break;
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}
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case KEY_EXCHANGE:
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{
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ke_payload_t *ke_payload = (ke_payload_t*)payload;
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this->dh_group = ke_payload->get_dh_group_number(ke_payload);
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if (!this->initiator)
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{
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this->dh = this->keymat->keymat.create_dh(
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&this->keymat->keymat, this->dh_group);
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}
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if (this->dh)
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{
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this->dh->set_other_public_value(this->dh,
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ke_payload->get_key_exchange_data(ke_payload));
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}
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break;
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}
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case NONCE:
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{
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nonce_payload_t *nonce_payload = (nonce_payload_t*)payload;
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this->other_nonce = nonce_payload->get_nonce(nonce_payload);
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break;
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}
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default:
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break;
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}
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}
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enumerator->destroy(enumerator);
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}
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METHOD(task_t, build_i, status_t,
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private_ike_init_t *this, message_t *message)
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{
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rng_t *rng;
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this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
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DBG0(DBG_IKE, "initiating IKE_SA %s[%d] to %H",
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this->ike_sa->get_name(this->ike_sa),
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this->ike_sa->get_unique_id(this->ike_sa),
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this->ike_sa->get_other_host(this->ike_sa));
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this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
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if (this->retry >= MAX_RETRIES)
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{
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DBG1(DBG_IKE, "giving up after %d retries", MAX_RETRIES);
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return FAILED;
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}
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/* if the DH group is set via use_dh_group(), we already have a DH object */
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if (!this->dh)
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{
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this->dh_group = this->config->get_dh_group(this->config);
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this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
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this->dh_group);
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if (!this->dh)
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{
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DBG1(DBG_IKE, "configured DH group %N not supported",
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diffie_hellman_group_names, this->dh_group);
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return FAILED;
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}
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}
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/* generate nonce only when we are trying the first time */
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if (this->my_nonce.ptr == NULL)
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{
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rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
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if (!rng)
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{
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DBG1(DBG_IKE, "error generating nonce");
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return FAILED;
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}
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rng->allocate_bytes(rng, NONCE_SIZE, &this->my_nonce);
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rng->destroy(rng);
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}
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if (this->cookie.ptr)
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{
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message->add_notify(message, FALSE, COOKIE, this->cookie);
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}
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build_payloads(this, message);
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#ifdef ME
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{
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chunk_t connect_id = this->ike_sa->get_connect_id(this->ike_sa);
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if (connect_id.ptr)
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{
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message->add_notify(message, FALSE, ME_CONNECTID, connect_id);
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}
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}
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#endif /* ME */
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return NEED_MORE;
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}
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METHOD(task_t, process_r, status_t,
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private_ike_init_t *this, message_t *message)
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{
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rng_t *rng;
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this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
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DBG0(DBG_IKE, "%H is initiating an IKE_SA", message->get_source(message));
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this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
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rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
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if (!rng)
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{
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DBG1(DBG_IKE, "error generating nonce");
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return FAILED;
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}
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rng->allocate_bytes(rng, NONCE_SIZE, &this->my_nonce);
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rng->destroy(rng);
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#ifdef ME
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{
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notify_payload_t *notify = message->get_notify(message, ME_CONNECTID);
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if (notify)
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{
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chunk_t connect_id = notify->get_notification_data(notify);
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DBG2(DBG_IKE, "received ME_CONNECTID %#B", &connect_id);
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charon->connect_manager->stop_checks(charon->connect_manager,
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connect_id);
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}
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}
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#endif /* ME */
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process_payloads(this, message);
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return NEED_MORE;
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}
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/**
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* Derive the keymat for the IKE_SA
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*/
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static bool derive_keys(private_ike_init_t *this,
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chunk_t nonce_i, chunk_t nonce_r)
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{
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keymat_v2_t *old_keymat;
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pseudo_random_function_t prf_alg = PRF_UNDEFINED;
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chunk_t skd = chunk_empty;
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ike_sa_id_t *id;
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id = this->ike_sa->get_id(this->ike_sa);
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if (this->old_sa)
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{
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/* rekeying: Include old SKd, use old PRF, apply SPI */
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old_keymat = (keymat_v2_t*)this->old_sa->get_keymat(this->old_sa);
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prf_alg = old_keymat->get_skd(old_keymat, &skd);
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if (this->initiator)
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{
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id->set_responder_spi(id, this->proposal->get_spi(this->proposal));
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}
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else
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{
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id->set_initiator_spi(id, this->proposal->get_spi(this->proposal));
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}
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}
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if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
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nonce_i, nonce_r, id, prf_alg, skd))
|
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{
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return FALSE;
|
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}
|
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charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh, chunk_empty,
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nonce_i, nonce_r, this->old_sa, NULL);
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return TRUE;
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}
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|
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METHOD(task_t, build_r, status_t,
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private_ike_init_t *this, message_t *message)
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{
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/* check if we have everything we need */
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if (this->proposal == NULL ||
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this->other_nonce.len == 0 || this->my_nonce.len == 0)
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{
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DBG1(DBG_IKE, "received proposals inacceptable");
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message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
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return FAILED;
|
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}
|
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this->ike_sa->set_proposal(this->ike_sa, this->proposal);
|
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|
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if (this->dh == NULL ||
|
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!this->proposal->has_dh_group(this->proposal, this->dh_group))
|
||||
{
|
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u_int16_t group;
|
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|
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if (this->proposal->get_algorithm(this->proposal, DIFFIE_HELLMAN_GROUP,
|
||||
&group, NULL))
|
||||
{
|
||||
DBG1(DBG_IKE, "DH group %N inacceptable, requesting %N",
|
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diffie_hellman_group_names, this->dh_group,
|
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diffie_hellman_group_names, group);
|
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this->dh_group = group;
|
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group = htons(group);
|
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message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
|
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chunk_from_thing(group));
|
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}
|
||||
else
|
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{
|
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DBG1(DBG_IKE, "no acceptable proposal found");
|
||||
}
|
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return FAILED;
|
||||
}
|
||||
|
||||
if (!derive_keys(this, this->other_nonce, this->my_nonce))
|
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{
|
||||
DBG1(DBG_IKE, "key derivation failed");
|
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message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
|
||||
return FAILED;
|
||||
}
|
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build_payloads(this, message);
|
||||
return SUCCESS;
|
||||
}
|
||||
|
||||
METHOD(task_t, process_i, status_t,
|
||||
private_ike_init_t *this, message_t *message)
|
||||
{
|
||||
enumerator_t *enumerator;
|
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payload_t *payload;
|
||||
|
||||
/* check for erronous notifies */
|
||||
enumerator = message->create_payload_enumerator(message);
|
||||
while (enumerator->enumerate(enumerator, &payload))
|
||||
{
|
||||
if (payload->get_type(payload) == NOTIFY)
|
||||
{
|
||||
notify_payload_t *notify = (notify_payload_t*)payload;
|
||||
notify_type_t type = notify->get_notify_type(notify);
|
||||
|
||||
switch (type)
|
||||
{
|
||||
case INVALID_KE_PAYLOAD:
|
||||
{
|
||||
chunk_t data;
|
||||
diffie_hellman_group_t bad_group;
|
||||
|
||||
bad_group = this->dh_group;
|
||||
data = notify->get_notification_data(notify);
|
||||
this->dh_group = ntohs(*((u_int16_t*)data.ptr));
|
||||
DBG1(DBG_IKE, "peer didn't accept DH group %N, "
|
||||
"it requested %N", diffie_hellman_group_names,
|
||||
bad_group, diffie_hellman_group_names, this->dh_group);
|
||||
|
||||
if (this->old_sa == NULL)
|
||||
{ /* reset the IKE_SA if we are not rekeying */
|
||||
this->ike_sa->reset(this->ike_sa);
|
||||
}
|
||||
|
||||
enumerator->destroy(enumerator);
|
||||
this->retry++;
|
||||
return NEED_MORE;
|
||||
}
|
||||
case NAT_DETECTION_SOURCE_IP:
|
||||
case NAT_DETECTION_DESTINATION_IP:
|
||||
/* skip, handled in ike_natd_t */
|
||||
break;
|
||||
case MULTIPLE_AUTH_SUPPORTED:
|
||||
/* handled in ike_auth_t */
|
||||
break;
|
||||
case COOKIE:
|
||||
{
|
||||
chunk_free(&this->cookie);
|
||||
this->cookie = chunk_clone(notify->get_notification_data(notify));
|
||||
this->ike_sa->reset(this->ike_sa);
|
||||
enumerator->destroy(enumerator);
|
||||
DBG2(DBG_IKE, "received %N notify", notify_type_names, type);
|
||||
this->retry++;
|
||||
return NEED_MORE;
|
||||
}
|
||||
default:
|
||||
{
|
||||
if (type <= 16383)
|
||||
{
|
||||
DBG1(DBG_IKE, "received %N notify error",
|
||||
notify_type_names, type);
|
||||
enumerator->destroy(enumerator);
|
||||
return FAILED;
|
||||
}
|
||||
DBG2(DBG_IKE, "received %N notify",
|
||||
notify_type_names, type);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
enumerator->destroy(enumerator);
|
||||
|
||||
process_payloads(this, message);
|
||||
|
||||
/* check if we have everything */
|
||||
if (this->proposal == NULL ||
|
||||
this->other_nonce.len == 0 || this->my_nonce.len == 0)
|
||||
{
|
||||
DBG1(DBG_IKE, "peers proposal selection invalid");
|
||||
return FAILED;
|
||||
}
|
||||
this->ike_sa->set_proposal(this->ike_sa, this->proposal);
|
||||
|
||||
if (this->dh == NULL ||
|
||||
!this->proposal->has_dh_group(this->proposal, this->dh_group))
|
||||
{
|
||||
DBG1(DBG_IKE, "peer DH group selection invalid");
|
||||
return FAILED;
|
||||
}
|
||||
|
||||
if (!derive_keys(this, this->my_nonce, this->other_nonce))
|
||||
{
|
||||
DBG1(DBG_IKE, "key derivation failed");
|
||||
return FAILED;
|
||||
}
|
||||
return SUCCESS;
|
||||
}
|
||||
|
||||
METHOD(task_t, get_type, task_type_t,
|
||||
private_ike_init_t *this)
|
||||
{
|
||||
return TASK_IKE_INIT;
|
||||
}
|
||||
|
||||
METHOD(task_t, migrate, void,
|
||||
private_ike_init_t *this, ike_sa_t *ike_sa)
|
||||
{
|
||||
DESTROY_IF(this->proposal);
|
||||
chunk_free(&this->other_nonce);
|
||||
|
||||
this->ike_sa = ike_sa;
|
||||
this->keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa);
|
||||
this->proposal = NULL;
|
||||
if (this->dh && this->dh->get_dh_group(this->dh) != this->dh_group)
|
||||
{ /* reset DH value only if group changed (INVALID_KE_PAYLOAD) */
|
||||
this->dh->destroy(this->dh);
|
||||
this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
|
||||
this->dh_group);
|
||||
}
|
||||
}
|
||||
|
||||
METHOD(task_t, destroy, void,
|
||||
private_ike_init_t *this)
|
||||
{
|
||||
DESTROY_IF(this->dh);
|
||||
DESTROY_IF(this->proposal);
|
||||
chunk_free(&this->my_nonce);
|
||||
chunk_free(&this->other_nonce);
|
||||
chunk_free(&this->cookie);
|
||||
free(this);
|
||||
}
|
||||
|
||||
METHOD(ike_init_t, get_lower_nonce, chunk_t,
|
||||
private_ike_init_t *this)
|
||||
{
|
||||
if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
|
||||
min(this->my_nonce.len, this->other_nonce.len)) < 0)
|
||||
{
|
||||
return this->my_nonce;
|
||||
}
|
||||
else
|
||||
{
|
||||
return this->other_nonce;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Described in header.
|
||||
*/
|
||||
ike_init_t *ike_init_create(ike_sa_t *ike_sa, bool initiator, ike_sa_t *old_sa)
|
||||
{
|
||||
private_ike_init_t *this;
|
||||
|
||||
INIT(this,
|
||||
.public = {
|
||||
.task = {
|
||||
.get_type = _get_type,
|
||||
.migrate = _migrate,
|
||||
.destroy = _destroy,
|
||||
},
|
||||
.get_lower_nonce = _get_lower_nonce,
|
||||
},
|
||||
.ike_sa = ike_sa,
|
||||
.initiator = initiator,
|
||||
.dh_group = MODP_NONE,
|
||||
.keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa),
|
||||
.old_sa = old_sa,
|
||||
);
|
||||
|
||||
if (initiator)
|
||||
{
|
||||
this->public.task.build = _build_i;
|
||||
this->public.task.process = _process_i;
|
||||
}
|
||||
else
|
||||
{
|
||||
this->public.task.build = _build_r;
|
||||
this->public.task.process = _process_r;
|
||||
}
|
||||
|
||||
return &this->public;
|
||||
}
|
||||
Reference in New Issue
Block a user