merged tasking branch into trunk
This commit is contained in:
Martin Willi
@@ -0,0 +1,718 @@
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/**
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* @file child_create.c
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*
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* @brief Implementation of the child_create task.
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*
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*/
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/*
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* Copyright (C) 2005-2007 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 "child_create.h"
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#include <daemon.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/ts_payload.h>
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#include <encoding/payloads/nonce_payload.h>
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#include <encoding/payloads/notify_payload.h>
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typedef struct private_child_create_t private_child_create_t;
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/**
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* Private members of a child_create_t task.
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*/
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struct private_child_create_t {
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/**
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* Public methods and task_t interface.
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*/
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child_create_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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* 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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* policy to create the CHILD_SA from
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*/
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policy_t *policy;
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/**
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* list of proposal candidates
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*/
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linked_list_t *proposals;
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/**
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* selected proposal to use for CHILD_SA
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*/
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proposal_t *proposal;
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/**
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* traffic selectors for initiators side
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*/
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linked_list_t *tsi;
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/**
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* traffic selectors for responders side
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*/
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linked_list_t *tsr;
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/**
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* mode the new CHILD_SA uses (transport/tunnel/beet)
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*/
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mode_t mode;
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/**
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* reqid to use if we are rekeying
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*/
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u_int32_t reqid;
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/**
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* CHILD_SA which gets established
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*/
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child_sa_t *child_sa;
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};
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/**
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* get the nonce from a message
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*/
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static status_t get_nonce(message_t *message, chunk_t *nonce)
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{
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nonce_payload_t *payload;
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payload = (nonce_payload_t*)message->get_payload(message, NONCE);
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if (payload == NULL)
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{
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return FAILED;
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}
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*nonce = payload->get_nonce(payload);
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return NEED_MORE;
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}
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/**
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* generate a new nonce to include in a CREATE_CHILD_SA message
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*/
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static status_t generate_nonce(chunk_t *nonce)
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{
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status_t status;
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randomizer_t *randomizer = randomizer_create();
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status = randomizer->allocate_pseudo_random_bytes(randomizer, NONCE_SIZE,
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nonce);
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randomizer->destroy(randomizer);
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if (status != SUCCESS)
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{
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DBG1(DBG_IKE, "error generating random nonce value");
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return FAILED;
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}
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return SUCCESS;
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}
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/**
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* Check a list of traffic selectors if any selector belongs to host
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*/
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static bool ts_list_is_host(linked_list_t *list, host_t *host)
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{
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traffic_selector_t *ts;
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bool is_host = TRUE;
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iterator_t *iterator = list->create_iterator(list, TRUE);
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while (is_host && iterator->iterate(iterator, (void**)&ts))
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{
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is_host = is_host && ts->is_host(ts, host);
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}
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iterator->destroy(iterator);
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return is_host;
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}
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/**
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* Install a CHILD_SA for usage
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*/
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static status_t select_and_install(private_child_create_t *this)
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{
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prf_plus_t *prf_plus;
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status_t status;
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chunk_t nonce_i, nonce_r, seed;
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linked_list_t *my_ts, *other_ts;
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host_t *me, *other, *other_vip, *my_vip;
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if (this->proposals == NULL || this->tsi == NULL || this->tsr == NULL)
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{
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SIG(CHILD_UP_FAILED, "SA/TS payloads missing in message");
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return FAILED;
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}
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if (this->initiator)
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{
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nonce_i = this->my_nonce;
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nonce_r = this->other_nonce;
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my_ts = this->tsi;
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other_ts = this->tsr;
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}
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else
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{
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nonce_r = this->my_nonce;
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nonce_i = this->other_nonce;
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my_ts = this->tsr;
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other_ts = this->tsi;
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}
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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_vip = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
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other_vip = this->ike_sa->get_virtual_ip(this->ike_sa, FALSE);
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this->proposal = this->policy->select_proposal(this->policy, this->proposals);
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if (this->initiator && my_vip)
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{ /* if we have a virtual IP, shorten our TS to the minimum */
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my_ts = this->policy->select_my_traffic_selectors(this->policy, my_ts,
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my_vip);
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}
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else
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{ /* shorten in the host2host case only */
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my_ts = this->policy->select_my_traffic_selectors(this->policy,
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my_ts, me);
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}
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if (other_vip)
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{ /* if other has a virtual IP, shorten it's traffic selectors to it */
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other_ts = this->policy->select_other_traffic_selectors(this->policy,
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other_ts, other_vip);
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}
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else
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{ /* use his host for the host2host case */
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other_ts = this->policy->select_other_traffic_selectors(this->policy,
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other_ts, other);
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}
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this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
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this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
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if (this->initiator)
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{
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this->tsi = my_ts;
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this->tsr = other_ts;
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}
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else
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{
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this->tsr = my_ts;
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this->tsi = other_ts;
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}
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if (this->proposal == NULL ||
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this->tsi->get_count(this->tsi) == 0 ||
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this->tsr->get_count(this->tsr) == 0)
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{
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SIG(CHILD_UP_FAILED, "no acceptable proposal found");
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return FAILED;
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}
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if (!this->initiator)
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{
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/* check if requested mode is acceptable, downgrade if required */
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switch (this->mode)
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{
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case MODE_TRANSPORT:
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if (!ts_list_is_host(this->tsi, other) ||
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!ts_list_is_host(this->tsr, me))
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{
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this->mode = MODE_TUNNEL;
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DBG1(DBG_IKE, "not using tranport mode, not host-to-host");
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}
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else if (this->ike_sa->is_natt_enabled(this->ike_sa))
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{
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this->mode = MODE_TUNNEL;
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DBG1(DBG_IKE, "not using tranport mode, connection NATed");
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}
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break;
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case MODE_BEET:
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if (!ts_list_is_host(this->tsi, NULL) ||
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!ts_list_is_host(this->tsr, NULL))
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{
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this->mode = MODE_TUNNEL;
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DBG1(DBG_IKE, "not using BEET mode, not host-to-host");
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}
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break;
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default:
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break;
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}
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}
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seed = chunk_cata("cc", nonce_i, nonce_r);
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prf_plus = prf_plus_create(this->ike_sa->get_child_prf(this->ike_sa), seed);
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if (this->initiator)
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{
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status = this->child_sa->update(this->child_sa, this->proposal,
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this->mode, prf_plus);
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}
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else
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{
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status = this->child_sa->add(this->child_sa, this->proposal,
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this->mode, prf_plus);
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}
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prf_plus->destroy(prf_plus);
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if (status != SUCCESS)
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{
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SIG(CHILD_UP_FAILED, "unable to install IPsec SA (SAD) in kernel");
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return status;
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}
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status = this->child_sa->add_policies(this->child_sa, my_ts, other_ts,
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this->mode);
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if (status != SUCCESS)
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{
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SIG(CHILD_UP_FAILED, "unable to install IPsec policies (SPD) in kernel");
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return status;
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}
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/* add to IKE_SA, and remove from task */
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this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
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this->ike_sa->add_child_sa(this->ike_sa, this->child_sa);
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this->child_sa = NULL;
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return SUCCESS;
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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_child_create_t *this, message_t *message)
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{
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sa_payload_t *sa_payload;
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ts_payload_t *ts_payload;
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nonce_payload_t *nonce_payload;
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/* add SA payload */
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if (this->initiator)
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{
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sa_payload = sa_payload_create_from_proposal_list(this->proposals);
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}
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else
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{
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sa_payload = sa_payload_create_from_proposal(this->proposal);
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}
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message->add_payload(message, (payload_t*)sa_payload);
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/* add TSi/TSr payloads */
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ts_payload = ts_payload_create_from_traffic_selectors(TRUE, this->tsi);
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message->add_payload(message, (payload_t*)ts_payload);
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ts_payload = ts_payload_create_from_traffic_selectors(FALSE, this->tsr);
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message->add_payload(message, (payload_t*)ts_payload);
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/* add nonce payload if not in IKE_AUTH */
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if (message->get_exchange_type(message) == CREATE_CHILD_SA)
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{
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nonce_payload = nonce_payload_create();
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nonce_payload->set_nonce(nonce_payload, this->my_nonce);
|
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message->add_payload(message, (payload_t*)nonce_payload);
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}
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|
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/* add a notify if we are not in tunnel mode */
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switch (this->mode)
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{
|
||||
case MODE_TRANSPORT:
|
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message->add_notify(message, FALSE, USE_TRANSPORT_MODE, chunk_empty);
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break;
|
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case MODE_BEET:
|
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message->add_notify(message, FALSE, USE_BEET_MODE, chunk_empty);
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||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Read payloads from message
|
||||
*/
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||||
static void process_payloads(private_child_create_t *this, message_t *message)
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||||
{
|
||||
iterator_t *iterator;
|
||||
payload_t *payload;
|
||||
sa_payload_t *sa_payload;
|
||||
ts_payload_t *ts_payload;
|
||||
notify_payload_t *notify_payload;
|
||||
|
||||
/* defaults to TUNNEL mode */
|
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this->mode = MODE_TUNNEL;
|
||||
|
||||
iterator = message->get_payload_iterator(message);
|
||||
while (iterator->iterate(iterator, (void**)&payload))
|
||||
{
|
||||
switch (payload->get_type(payload))
|
||||
{
|
||||
case SECURITY_ASSOCIATION:
|
||||
sa_payload = (sa_payload_t*)payload;
|
||||
this->proposals = sa_payload->get_proposals(sa_payload);
|
||||
break;
|
||||
case TRAFFIC_SELECTOR_INITIATOR:
|
||||
ts_payload = (ts_payload_t*)payload;
|
||||
this->tsi = ts_payload->get_traffic_selectors(ts_payload);
|
||||
break;
|
||||
case TRAFFIC_SELECTOR_RESPONDER:
|
||||
ts_payload = (ts_payload_t*)payload;
|
||||
this->tsr = ts_payload->get_traffic_selectors(ts_payload);
|
||||
break;
|
||||
case NOTIFY:
|
||||
notify_payload = (notify_payload_t*)payload;
|
||||
switch (notify_payload ->get_notify_type(notify_payload ))
|
||||
{
|
||||
case USE_TRANSPORT_MODE:
|
||||
this->mode = MODE_TRANSPORT;
|
||||
break;
|
||||
case USE_BEET_MODE:
|
||||
this->mode = MODE_BEET;
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
iterator->destroy(iterator);
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of task_t.build for initiator
|
||||
*/
|
||||
static status_t build_i(private_child_create_t *this, message_t *message)
|
||||
{
|
||||
host_t *me, *other, *vip;
|
||||
|
||||
switch (message->get_exchange_type(message))
|
||||
{
|
||||
case IKE_SA_INIT:
|
||||
return get_nonce(message, &this->my_nonce);
|
||||
case CREATE_CHILD_SA:
|
||||
if (generate_nonce(&this->my_nonce) != SUCCESS)
|
||||
{
|
||||
message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
|
||||
return SUCCESS;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
SIG(CHILD_UP_START, "establishing CHILD_SA");
|
||||
|
||||
me = this->ike_sa->get_my_host(this->ike_sa);
|
||||
other = this->ike_sa->get_other_host(this->ike_sa);
|
||||
vip = this->policy->get_virtual_ip(this->policy, NULL);
|
||||
|
||||
if (vip)
|
||||
{ /* propose a 0.0.0.0/0 subnet when we use virtual ip */
|
||||
this->tsi = this->policy->get_my_traffic_selectors(this->policy, NULL);
|
||||
vip->destroy(vip);
|
||||
}
|
||||
else
|
||||
{ /* but shorten a 0.0.0.0/0 subnet to the actual address if host2host */
|
||||
this->tsi = this->policy->get_my_traffic_selectors(this->policy, me);
|
||||
}
|
||||
this->tsr = this->policy->get_other_traffic_selectors(this->policy, other);
|
||||
this->proposals = this->policy->get_proposals(this->policy);
|
||||
this->mode = this->policy->get_mode(this->policy);
|
||||
|
||||
this->child_sa = child_sa_create(me, other,
|
||||
this->ike_sa->get_my_id(this->ike_sa),
|
||||
this->ike_sa->get_other_id(this->ike_sa),
|
||||
this->policy, this->reqid,
|
||||
this->ike_sa->is_natt_enabled(this->ike_sa));
|
||||
|
||||
if (this->child_sa->alloc(this->child_sa, this->proposals) != SUCCESS)
|
||||
{
|
||||
SIG(CHILD_UP_FAILED, "unable to allocate SPIs from kernel");
|
||||
return FAILED;
|
||||
}
|
||||
|
||||
build_payloads(this, message);
|
||||
|
||||
this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
|
||||
this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
|
||||
this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
|
||||
this->tsi = NULL;
|
||||
this->tsr = NULL;
|
||||
this->proposals = NULL;
|
||||
|
||||
return NEED_MORE;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of task_t.process for initiator
|
||||
*/
|
||||
static status_t process_r(private_child_create_t *this, message_t *message)
|
||||
{
|
||||
switch (message->get_exchange_type(message))
|
||||
{
|
||||
case IKE_SA_INIT:
|
||||
return get_nonce(message, &this->other_nonce);
|
||||
case CREATE_CHILD_SA:
|
||||
get_nonce(message, &this->other_nonce);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
process_payloads(this, message);
|
||||
|
||||
if (this->tsi == NULL || this->tsr == NULL)
|
||||
{
|
||||
DBG1(DBG_IKE, "TS payload missing in message");
|
||||
return NEED_MORE;
|
||||
}
|
||||
|
||||
this->policy = charon->policies->get_policy(charon->policies,
|
||||
this->ike_sa->get_my_id(this->ike_sa),
|
||||
this->ike_sa->get_other_id(this->ike_sa),
|
||||
this->tsr, this->tsi,
|
||||
this->ike_sa->get_my_host(this->ike_sa),
|
||||
this->ike_sa->get_other_host(this->ike_sa));
|
||||
|
||||
if (this->policy && this->ike_sa->get_policy(this->ike_sa) == NULL)
|
||||
{
|
||||
this->ike_sa->set_policy(this->ike_sa, this->policy);
|
||||
}
|
||||
|
||||
return NEED_MORE;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of task_t.build for responder
|
||||
*/
|
||||
static status_t build_r(private_child_create_t *this, message_t *message)
|
||||
{
|
||||
switch (message->get_exchange_type(message))
|
||||
{
|
||||
case IKE_SA_INIT:
|
||||
return get_nonce(message, &this->my_nonce);
|
||||
case CREATE_CHILD_SA:
|
||||
if (generate_nonce(&this->my_nonce) != SUCCESS)
|
||||
{
|
||||
message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
|
||||
return SUCCESS;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
if (this->policy == NULL)
|
||||
{
|
||||
SIG(CHILD_UP_FAILED, "received traffic selectors inacceptable");
|
||||
message->add_notify(message, FALSE, TS_UNACCEPTABLE, chunk_empty);
|
||||
return SUCCESS;
|
||||
}
|
||||
|
||||
this->child_sa = child_sa_create(this->ike_sa->get_my_host(this->ike_sa),
|
||||
this->ike_sa->get_other_host(this->ike_sa),
|
||||
this->ike_sa->get_my_id(this->ike_sa),
|
||||
this->ike_sa->get_other_id(this->ike_sa),
|
||||
this->policy, this->reqid,
|
||||
this->ike_sa->is_natt_enabled(this->ike_sa));
|
||||
|
||||
if (select_and_install(this) != SUCCESS)
|
||||
{
|
||||
message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
|
||||
return SUCCESS;
|
||||
}
|
||||
|
||||
build_payloads(this, message);
|
||||
|
||||
SIG(CHILD_UP_SUCCESS, "established CHILD_SA successfully");
|
||||
|
||||
return SUCCESS;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of task_t.process for initiator
|
||||
*/
|
||||
static status_t process_i(private_child_create_t *this, message_t *message)
|
||||
{
|
||||
iterator_t *iterator;
|
||||
payload_t *payload;
|
||||
status_t status;
|
||||
|
||||
switch (message->get_exchange_type(message))
|
||||
{
|
||||
case IKE_SA_INIT:
|
||||
return get_nonce(message, &this->other_nonce);
|
||||
case CREATE_CHILD_SA:
|
||||
get_nonce(message, &this->other_nonce);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
/* check for erronous notifies */
|
||||
iterator = message->get_payload_iterator(message);
|
||||
while (iterator->iterate(iterator, (void**)&payload))
|
||||
{
|
||||
if (payload->get_type(payload) == NOTIFY)
|
||||
{
|
||||
notify_payload_t *notify = (notify_payload_t*)payload;
|
||||
notify_type_t type = notify->get_notify_type(notify);
|
||||
|
||||
if (type < 16383)
|
||||
{
|
||||
SIG(CHILD_UP_FAILED, "received %N notify error",
|
||||
notify_type_names, type);
|
||||
iterator->destroy(iterator);
|
||||
/* an error in CHILD_SA creation is not critical */
|
||||
return SUCCESS;
|
||||
}
|
||||
}
|
||||
}
|
||||
iterator->destroy(iterator);
|
||||
|
||||
process_payloads(this, message);
|
||||
|
||||
status = select_and_install(this);
|
||||
|
||||
SIG(CHILD_UP_SUCCESS, "established CHILD_SA successfully");
|
||||
|
||||
return SUCCESS;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of task_t.get_type
|
||||
*/
|
||||
static task_type_t get_type(private_child_create_t *this)
|
||||
{
|
||||
return CHILD_CREATE;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of child_create_t.use_reqid
|
||||
*/
|
||||
static void use_reqid(private_child_create_t *this, u_int32_t reqid)
|
||||
{
|
||||
this->reqid = reqid;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of task_t.migrate
|
||||
*/
|
||||
static void migrate(private_child_create_t *this, ike_sa_t *ike_sa)
|
||||
{
|
||||
chunk_free(&this->my_nonce);
|
||||
chunk_free(&this->other_nonce);
|
||||
if (this->tsi)
|
||||
{
|
||||
this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
|
||||
}
|
||||
if (this->tsr)
|
||||
{
|
||||
this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
|
||||
}
|
||||
DESTROY_IF(this->child_sa);
|
||||
DESTROY_IF(this->proposal);
|
||||
if (this->proposals)
|
||||
{
|
||||
this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
|
||||
}
|
||||
|
||||
this->ike_sa = ike_sa;
|
||||
this->proposals = NULL;
|
||||
this->tsi = NULL;
|
||||
this->tsr = NULL;
|
||||
this->child_sa = NULL;
|
||||
this->mode = MODE_TUNNEL;
|
||||
this->reqid = 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of task_t.destroy
|
||||
*/
|
||||
static void destroy(private_child_create_t *this)
|
||||
{
|
||||
chunk_free(&this->my_nonce);
|
||||
chunk_free(&this->other_nonce);
|
||||
if (this->tsi)
|
||||
{
|
||||
this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
|
||||
}
|
||||
if (this->tsr)
|
||||
{
|
||||
this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
|
||||
}
|
||||
DESTROY_IF(this->child_sa);
|
||||
DESTROY_IF(this->proposal);
|
||||
if (this->proposals)
|
||||
{
|
||||
this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
|
||||
}
|
||||
|
||||
DESTROY_IF(this->policy);
|
||||
free(this);
|
||||
}
|
||||
|
||||
/*
|
||||
* Described in header.
|
||||
*/
|
||||
child_create_t *child_create_create(ike_sa_t *ike_sa, policy_t *policy)
|
||||
{
|
||||
private_child_create_t *this = malloc_thing(private_child_create_t);
|
||||
|
||||
this->public.use_reqid = (void(*)(child_create_t*,u_int32_t))use_reqid;
|
||||
this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
|
||||
this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
|
||||
this->public.task.destroy = (void(*)(task_t*))destroy;
|
||||
if (policy)
|
||||
{
|
||||
this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
|
||||
this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
|
||||
this->initiator = TRUE;
|
||||
policy->get_ref(policy);
|
||||
}
|
||||
else
|
||||
{
|
||||
this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
|
||||
this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
|
||||
this->initiator = FALSE;
|
||||
}
|
||||
|
||||
this->ike_sa = ike_sa;
|
||||
this->policy = policy;
|
||||
this->my_nonce = chunk_empty;
|
||||
this->other_nonce = chunk_empty;
|
||||
this->proposals = NULL;
|
||||
this->proposal = NULL;
|
||||
this->tsi = NULL;
|
||||
this->tsr = NULL;
|
||||
this->child_sa = NULL;
|
||||
this->mode = MODE_TUNNEL;
|
||||
this->reqid = 0;
|
||||
|
||||
return &this->public;
|
||||
}
|
||||
Reference in New Issue
Block a user