669 lines
16 KiB
C
669 lines
16 KiB
C
/*
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* Copyright (C) 2011 Tobias Brunner
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* Hochschule fuer Technik Rapperswil
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*
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* Copyright (C) 2011 Martin Willi
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* Copyright (C) 2011 revosec AG
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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 "main_mode.h"
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#include <string.h>
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#include <daemon.h>
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#include <sa/keymat_v1.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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#include <encoding/payloads/id_payload.h>
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typedef struct private_main_mode_t private_main_mode_t;
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/**
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* Private members of a main_mode_t task.
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*/
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struct private_main_mode_t {
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/**
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* Public methods and task_t interface.
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*/
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main_mode_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 *ike_cfg;
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/**
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* Peer config to use
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*/
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peer_cfg_t *peer_cfg;
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/**
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* Local authentication configuration
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*/
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auth_cfg_t *my_auth;
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/**
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* Remote authentication configuration
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*/
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auth_cfg_t *other_auth;
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/**
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* selected IKE proposal
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*/
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proposal_t *proposal;
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/**
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* DH exchange
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*/
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diffie_hellman_t *dh;
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/**
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* Keymat derivation (from SA)
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*/
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keymat_v1_t *keymat;
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/**
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* Received public DH value from peer
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*/
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chunk_t dh_value;
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/**
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* Initiators nonce
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*/
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chunk_t nonce_i;
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/**
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* Responder nonce
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*/
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chunk_t nonce_r;
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/** states of main mode */
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enum {
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MM_INIT,
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MM_SA,
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MM_KE,
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MM_AUTH,
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} state;
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};
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/**
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* Get the first authentcation config from peer config
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*/
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static auth_cfg_t *get_auth_cfg(private_main_mode_t *this, bool local)
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{
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enumerator_t *enumerator;
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auth_cfg_t *cfg = NULL;
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enumerator = this->peer_cfg->create_auth_cfg_enumerator(this->peer_cfg,
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local);
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enumerator->enumerate(enumerator, &cfg);
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enumerator->destroy(enumerator);
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return cfg;
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}
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METHOD(task_t, build_i, status_t,
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private_main_mode_t *this, message_t *message)
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{
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switch (this->state)
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{
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case MM_INIT:
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{
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sa_payload_t *sa_payload;
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linked_list_t *proposals;
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this->ike_cfg = 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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proposals = this->ike_cfg->get_proposals(this->ike_cfg);
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sa_payload = sa_payload_create_from_proposal_list(
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SECURITY_ASSOCIATION_V1, proposals);
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proposals->destroy_offset(proposals, offsetof(proposal_t, destroy));
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message->add_payload(message, &sa_payload->payload_interface);
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this->state = MM_SA;
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return NEED_MORE;
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}
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case MM_SA:
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{
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ke_payload_t *ke_payload;
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nonce_payload_t *nonce_payload;
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u_int16_t group;
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rng_t *rng;
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if (!this->proposal->get_algorithm(this->proposal,
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DIFFIE_HELLMAN_GROUP, &group, NULL))
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{
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DBG1(DBG_IKE, "DH group selection failed");
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return FAILED;
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}
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this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
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group);
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if (!this->dh)
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{
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DBG1(DBG_IKE, "negotiated DH group not supported");
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return FAILED;
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}
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ke_payload = ke_payload_create_from_diffie_hellman(KEY_EXCHANGE_V1,
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this->dh);
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message->add_payload(message, &ke_payload->payload_interface);
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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, "no RNG found to create nonce");
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return FAILED;
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}
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rng->allocate_bytes(rng, NONCE_SIZE, &this->nonce_i);
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rng->destroy(rng);
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nonce_payload = nonce_payload_create(NONCE_V1);
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nonce_payload->set_nonce(nonce_payload, this->nonce_i);
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message->add_payload(message, &nonce_payload->payload_interface);
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this->state = MM_KE;
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return NEED_MORE;
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}
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case MM_KE:
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{
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id_payload_t *id_payload;
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identification_t *id;
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this->peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
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this->peer_cfg->get_ref(this->peer_cfg);
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this->my_auth = get_auth_cfg(this, TRUE);
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this->other_auth = get_auth_cfg(this, FALSE);
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if (!this->my_auth || !this->other_auth)
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{
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DBG1(DBG_CFG, "no auth config found");
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return FAILED;
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}
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id = this->my_auth->get(this->my_auth, AUTH_RULE_IDENTITY);
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if (!id)
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{
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DBG1(DBG_CFG, "own identity not known");
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return FAILED;
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}
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this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
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id_payload = id_payload_create_from_identification(ID_V1, id);
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message->add_payload(message, &id_payload->payload_interface);
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/* TODO-IKEv1: authenticate */
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this->state = MM_AUTH;
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return NEED_MORE;
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}
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default:
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return FAILED;
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}
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}
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METHOD(task_t, process_r, status_t,
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private_main_mode_t *this, message_t *message)
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{
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switch (this->state)
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{
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case MM_INIT:
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{
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linked_list_t *list;
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sa_payload_t *sa_payload;
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this->ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
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DBG0(DBG_IKE, "%H is initiating a Main Mode",
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message->get_source(message));
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this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
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this->ike_sa->update_hosts(this->ike_sa,
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message->get_destination(message),
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message->get_source(message), TRUE);
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sa_payload = (sa_payload_t*)message->get_payload(message,
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SECURITY_ASSOCIATION_V1);
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if (!sa_payload)
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{
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DBG1(DBG_IKE, "SA payload missing");
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return FAILED;
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}
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list = sa_payload->get_proposals(sa_payload);
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this->proposal = this->ike_cfg->select_proposal(this->ike_cfg,
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list, FALSE);
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list->destroy_offset(list, offsetof(proposal_t, destroy));
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if (!this->proposal)
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{
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DBG1(DBG_IKE, "no proposal found");
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return FAILED;
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}
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this->state = MM_SA;
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return NEED_MORE;
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}
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case MM_SA:
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{
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ke_payload_t *ke_payload;
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nonce_payload_t *nonce_payload;
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u_int16_t group;
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ke_payload = (ke_payload_t*)message->get_payload(message,
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KEY_EXCHANGE_V1);
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if (!ke_payload)
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{
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DBG1(DBG_IKE, "KE payload missing");
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return FAILED;
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}
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this->dh_value = ke_payload->get_key_exchange_data(ke_payload);
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this->dh_value = chunk_clone(this->dh_value);
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if (!this->proposal->get_algorithm(this->proposal,
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DIFFIE_HELLMAN_GROUP, &group, NULL))
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{
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DBG1(DBG_IKE, "DH group selection failed");
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return FAILED;
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}
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this->dh = lib->crypto->create_dh(lib->crypto, group);
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if (!this->dh)
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{
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DBG1(DBG_IKE, "negotiated DH group not supported");
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return FAILED;
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}
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this->dh->set_other_public_value(this->dh, this->dh_value);
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nonce_payload = (nonce_payload_t*)message->get_payload(message,
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NONCE_V1);
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if (!nonce_payload)
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{
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DBG1(DBG_IKE, "Nonce payload missing");
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return FAILED;
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}
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this->nonce_i = nonce_payload->get_nonce(nonce_payload);
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this->state = MM_KE;
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return NEED_MORE;
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}
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case MM_KE:
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{
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enumerator_t *enumerator;
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id_payload_t *id_payload;
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identification_t *id, *any;
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id_payload = (id_payload_t*)message->get_payload(message, ID_V1);
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if (!id_payload)
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{
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DBG1(DBG_IKE, "IDii payload missing");
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return FAILED;
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}
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id = id_payload->get_identification(id_payload);
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any = identification_create_from_encoding(ID_ANY, chunk_empty);
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enumerator = charon->backends->create_peer_cfg_enumerator(
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charon->backends,
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this->ike_sa->get_my_host(this->ike_sa),
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this->ike_sa->get_other_host(this->ike_sa),
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any, id);
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if (!enumerator->enumerate(enumerator, &this->peer_cfg))
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{
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DBG1(DBG_IKE, "no peer config found");
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id->destroy(id);
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any->destroy(any);
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enumerator->destroy(enumerator);
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return FAILED;
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}
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this->peer_cfg->get_ref(this->peer_cfg);
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enumerator->destroy(enumerator);
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any->destroy(any);
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this->ike_sa->set_other_id(this->ike_sa, id);
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this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
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this->my_auth = get_auth_cfg(this, TRUE);
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this->other_auth = get_auth_cfg(this, FALSE);
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if (!this->my_auth || !this->other_auth)
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{
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DBG1(DBG_CFG, "auth config missing");
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return FAILED;
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}
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/* TODO-IKEv1: authenticate peer */
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this->state = MM_AUTH;
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return NEED_MORE;
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}
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default:
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return FAILED;
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}
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}
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/**
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* Lookup a shared secret for this IKE_SA
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*/
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static shared_key_t *lookup_shared_key(private_main_mode_t *this)
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{
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host_t *me, *other;
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identification_t *my_id, *other_id;
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shared_key_t *shared_key;
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me = this->ike_sa->get_my_host(this->ike_sa);
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other = this->ike_sa->get_other_host(this->ike_sa);
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my_id = identification_create_from_sockaddr(me->get_sockaddr(me));
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other_id = identification_create_from_sockaddr(other->get_sockaddr(other));
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if (!my_id || !other_id)
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{
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DESTROY_IF(my_id);
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DESTROY_IF(other_id);
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return NULL;
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}
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shared_key = lib->credmgr->get_shared(lib->credmgr, SHARED_IKE, my_id,
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other_id);
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if (!shared_key)
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{
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DBG1(DBG_IKE, "no shared key found for %H - %H", me, other);
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}
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my_id->destroy(my_id);
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other_id->destroy(other_id);
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return shared_key;
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}
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/**
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* Derive key material for this IKE_SA
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*/
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static bool derive_keys(private_main_mode_t *this, chunk_t nonce_i,
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chunk_t nonce_r)
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{
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ike_sa_id_t *id = this->ike_sa->get_id(this->ike_sa);
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shared_key_t *shared_key = NULL;
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auth_class_t auth;
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/* TODO-IKEv1: support other authentication classes */
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auth = AUTH_CLASS_PSK;
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switch (auth)
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{
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case AUTH_CLASS_PSK:
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shared_key = lookup_shared_key(this);
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break;
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default:
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break;
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}
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if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
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this->dh_value, nonce_i, nonce_r, id, auth, shared_key))
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{
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DESTROY_IF(shared_key);
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return FALSE;
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}
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DESTROY_IF(shared_key);
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charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh, nonce_i, nonce_r,
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NULL);
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return TRUE;
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}
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METHOD(task_t, build_r, status_t,
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private_main_mode_t *this, message_t *message)
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{
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switch (this->state)
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{
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case MM_SA:
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{
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sa_payload_t *sa_payload;
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sa_payload = sa_payload_create_from_proposal(SECURITY_ASSOCIATION_V1,
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this->proposal);
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message->add_payload(message, &sa_payload->payload_interface);
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return NEED_MORE;
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}
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case MM_KE:
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{
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ke_payload_t *ke_payload;
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nonce_payload_t *nonce_payload;
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rng_t *rng;
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ke_payload = ke_payload_create_from_diffie_hellman(KEY_EXCHANGE_V1,
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this->dh);
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message->add_payload(message, &ke_payload->payload_interface);
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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, "no RNG found to create nonce");
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return FAILED;
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}
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rng->allocate_bytes(rng, NONCE_SIZE, &this->nonce_r);
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rng->destroy(rng);
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if (!derive_keys(this, this->nonce_i, this->nonce_r))
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{
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DBG1(DBG_IKE, "key derivation failed");
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return FAILED;
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}
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nonce_payload = nonce_payload_create(NONCE_V1);
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nonce_payload->set_nonce(nonce_payload, this->nonce_r);
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message->add_payload(message, &nonce_payload->payload_interface);
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return NEED_MORE;
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}
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case MM_AUTH:
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{
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id_payload_t *id_payload;
|
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identification_t *id;
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id = this->my_auth->get(this->my_auth, AUTH_RULE_IDENTITY);
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if (!id)
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{
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DBG1(DBG_CFG, "own identity not known");
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return FAILED;
|
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}
|
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|
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this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
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id_payload = id_payload_create_from_identification(ID_V1, id);
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message->add_payload(message, &id_payload->payload_interface);
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/* TODO-IKEv1: authenticate us */
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/* TODO-IKEv1: check for XAUTH rounds, queue them */
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DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
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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_my_host(this->ike_sa),
|
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this->ike_sa->get_my_id(this->ike_sa),
|
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this->ike_sa->get_other_host(this->ike_sa),
|
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this->ike_sa->get_other_id(this->ike_sa));
|
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this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
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charon->bus->ike_updown(charon->bus, this->ike_sa, TRUE);
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return SUCCESS;
|
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}
|
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default:
|
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return FAILED;
|
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}
|
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}
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|
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METHOD(task_t, process_i, status_t,
|
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private_main_mode_t *this, message_t *message)
|
|
{
|
|
switch (this->state)
|
|
{
|
|
case MM_SA:
|
|
{
|
|
linked_list_t *list;
|
|
sa_payload_t *sa_payload;
|
|
|
|
sa_payload = (sa_payload_t*)message->get_payload(message,
|
|
SECURITY_ASSOCIATION_V1);
|
|
if (!sa_payload)
|
|
{
|
|
DBG1(DBG_IKE, "SA payload missing");
|
|
return FAILED;
|
|
}
|
|
list = sa_payload->get_proposals(sa_payload);
|
|
this->proposal = this->ike_cfg->select_proposal(this->ike_cfg,
|
|
list, FALSE);
|
|
list->destroy_offset(list, offsetof(proposal_t, destroy));
|
|
if (!this->proposal)
|
|
{
|
|
DBG1(DBG_IKE, "no proposal found");
|
|
return FAILED;
|
|
}
|
|
return NEED_MORE;
|
|
}
|
|
case MM_KE:
|
|
{
|
|
ke_payload_t *ke_payload;
|
|
nonce_payload_t *nonce_payload;
|
|
|
|
ke_payload = (ke_payload_t*)message->get_payload(message,
|
|
KEY_EXCHANGE_V1);
|
|
if (!ke_payload)
|
|
{
|
|
DBG1(DBG_IKE, "KE payload missing");
|
|
return FAILED;
|
|
}
|
|
this->dh_value = ke_payload->get_key_exchange_data(ke_payload);
|
|
this->dh_value = chunk_clone(this->dh_value);
|
|
this->dh->set_other_public_value(this->dh, this->dh_value);
|
|
|
|
nonce_payload = (nonce_payload_t*)message->get_payload(message,
|
|
NONCE_V1);
|
|
if (!nonce_payload)
|
|
{
|
|
DBG1(DBG_IKE, "Nonce payload missing");
|
|
return FAILED;
|
|
}
|
|
this->nonce_r = nonce_payload->get_nonce(nonce_payload);
|
|
|
|
if (!derive_keys(this, this->nonce_i, this->nonce_r))
|
|
{
|
|
DBG1(DBG_IKE, "key derivation failed");
|
|
return FAILED;
|
|
}
|
|
|
|
return NEED_MORE;
|
|
}
|
|
case MM_AUTH:
|
|
{
|
|
id_payload_t *id_payload;
|
|
identification_t *id;
|
|
|
|
id_payload = (id_payload_t*)message->get_payload(message, ID_V1);
|
|
if (!id_payload)
|
|
{
|
|
DBG1(DBG_IKE, "IDir payload missing");
|
|
return FAILED;
|
|
}
|
|
id = id_payload->get_identification(id_payload);
|
|
if (!id->matches(id, this->other_auth->get(this->other_auth,
|
|
AUTH_RULE_IDENTITY)))
|
|
{
|
|
DBG1(DBG_IKE, "IDir does not match");
|
|
id->destroy(id);
|
|
return FAILED;
|
|
}
|
|
this->ike_sa->set_other_id(this->ike_sa, id);
|
|
|
|
/* TODO-IKEv1: verify auth */
|
|
|
|
/* TODO-IKEv1: check for XAUTH rounds, queue them */
|
|
DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
|
|
this->ike_sa->get_name(this->ike_sa),
|
|
this->ike_sa->get_unique_id(this->ike_sa),
|
|
this->ike_sa->get_my_host(this->ike_sa),
|
|
this->ike_sa->get_my_id(this->ike_sa),
|
|
this->ike_sa->get_other_host(this->ike_sa),
|
|
this->ike_sa->get_other_id(this->ike_sa));
|
|
this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
|
|
charon->bus->ike_updown(charon->bus, this->ike_sa, TRUE);
|
|
return SUCCESS;
|
|
}
|
|
default:
|
|
return FAILED;
|
|
}
|
|
}
|
|
|
|
METHOD(task_t, get_type, task_type_t,
|
|
private_main_mode_t *this)
|
|
{
|
|
return TASK_MAIN_MODE;
|
|
}
|
|
|
|
METHOD(task_t, migrate, void,
|
|
private_main_mode_t *this, ike_sa_t *ike_sa)
|
|
{
|
|
this->ike_sa = ike_sa;
|
|
}
|
|
|
|
METHOD(task_t, destroy, void,
|
|
private_main_mode_t *this)
|
|
{
|
|
DESTROY_IF(this->peer_cfg);
|
|
DESTROY_IF(this->proposal);
|
|
DESTROY_IF(this->dh);
|
|
free(this->dh_value.ptr);
|
|
free(this->nonce_i.ptr);
|
|
free(this->nonce_r.ptr);
|
|
free(this);
|
|
}
|
|
|
|
/*
|
|
* Described in header.
|
|
*/
|
|
main_mode_t *main_mode_create(ike_sa_t *ike_sa, bool initiator)
|
|
{
|
|
private_main_mode_t *this;
|
|
|
|
INIT(this,
|
|
.public = {
|
|
.task = {
|
|
.get_type = _get_type,
|
|
.migrate = _migrate,
|
|
.destroy = _destroy,
|
|
},
|
|
},
|
|
.ike_sa = ike_sa,
|
|
.keymat = (keymat_v1_t*)ike_sa->get_keymat(ike_sa),
|
|
.initiator = initiator,
|
|
.state = MM_INIT,
|
|
);
|
|
|
|
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;
|
|
}
|