804 lines
19 KiB
C
804 lines
19 KiB
C
/**
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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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* config to create the CHILD_SA from
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*/
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child_cfg_t *config;
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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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* successfully established the CHILD?
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*/
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bool established;
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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->config->select_proposal(this->config, this->proposals);
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if (this->proposal == NULL)
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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 (my_vip == NULL)
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{
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my_vip = me;
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}
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else if (this->initiator)
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{
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/* to setup firewall rules correctly, CHILD_SA needs the virtual IP */
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this->child_sa->set_virtual_ip(this->child_sa, my_vip);
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}
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if (other_vip == NULL)
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{
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other_vip = other;
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}
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my_ts = this->config->get_traffic_selectors(this->config, TRUE, my_ts,
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my_vip);
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other_ts = this->config->get_traffic_selectors(this->config, FALSE, other_ts,
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other_vip);
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if (my_ts->get_count(my_ts) == 0 || other_ts->get_count(other_ts) == 0)
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{
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SIG(CHILD_UP_FAILED, "no acceptable traffic selectors found");
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return FAILED;
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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->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->established = TRUE;
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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 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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/* 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 a notify if we are not in tunnel mode */
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switch (this->mode)
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{
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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;
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default:
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break;
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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_child_create_t *this, message_t *message)
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{
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iterator_t *iterator;
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payload_t *payload;
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sa_payload_t *sa_payload;
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ts_payload_t *ts_payload;
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notify_payload_t *notify_payload;
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/* defaults to TUNNEL mode */
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this->mode = MODE_TUNNEL;
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iterator = message->get_payload_iterator(message);
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while (iterator->iterate(iterator, (void**)&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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sa_payload = (sa_payload_t*)payload;
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this->proposals = sa_payload->get_proposals(sa_payload);
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break;
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case TRAFFIC_SELECTOR_INITIATOR:
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ts_payload = (ts_payload_t*)payload;
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this->tsi = ts_payload->get_traffic_selectors(ts_payload);
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break;
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case TRAFFIC_SELECTOR_RESPONDER:
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ts_payload = (ts_payload_t*)payload;
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this->tsr = ts_payload->get_traffic_selectors(ts_payload);
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break;
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case NOTIFY:
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notify_payload = (notify_payload_t*)payload;
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switch (notify_payload ->get_notify_type(notify_payload ))
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{
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case USE_TRANSPORT_MODE:
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this->mode = MODE_TRANSPORT;
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break;
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case USE_BEET_MODE:
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this->mode = MODE_BEET;
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break;
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default:
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break;
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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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iterator->destroy(iterator);
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}
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/**
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* Implementation of task_t.build for initiator
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*/
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static status_t build_i(private_child_create_t *this, message_t *message)
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{
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host_t *me, *other, *vip;
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peer_cfg_t *peer_cfg;
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switch (message->get_exchange_type(message))
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{
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case IKE_SA_INIT:
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return get_nonce(message, &this->my_nonce);
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case CREATE_CHILD_SA:
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if (generate_nonce(&this->my_nonce) != SUCCESS)
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{
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message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
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return SUCCESS;
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}
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break;
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case IKE_AUTH:
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if (!message->get_payload(message, ID_INITIATOR))
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{
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/* send only in the first request, not in subsequent EAP */
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return NEED_MORE;
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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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SIG(CHILD_UP_START, "establishing CHILD_SA");
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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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peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
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vip = peer_cfg->get_virtual_ip(peer_cfg, NULL);
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if (vip)
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{ /* propose a 0.0.0.0/0 subnet when we use virtual ip */
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this->tsi = this->config->get_traffic_selectors(this->config, TRUE,
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NULL, NULL);
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vip->destroy(vip);
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}
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else
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{ /* but shorten a 0.0.0.0/0 subnet to the actual address if host2host */
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this->tsi = this->config->get_traffic_selectors(this->config, TRUE,
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NULL, me);
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}
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this->tsr = this->config->get_traffic_selectors(this->config, FALSE,
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NULL, other);
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this->proposals = this->config->get_proposals(this->config);
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this->mode = this->config->get_mode(this->config);
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this->child_sa = child_sa_create(me, other,
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this->ike_sa->get_my_id(this->ike_sa),
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this->ike_sa->get_other_id(this->ike_sa),
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this->config, this->reqid,
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this->ike_sa->is_natt_enabled(this->ike_sa));
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if (this->child_sa->alloc(this->child_sa, this->proposals) != SUCCESS)
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{
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SIG(CHILD_UP_FAILED, "unable to allocate SPIs from kernel");
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return FAILED;
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}
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build_payloads(this, message);
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this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
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this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
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this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
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this->tsi = NULL;
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this->tsr = NULL;
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this->proposals = NULL;
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.process for initiator
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*/
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static status_t process_r(private_child_create_t *this, message_t *message)
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{
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peer_cfg_t *peer_cfg;
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switch (message->get_exchange_type(message))
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{
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case IKE_SA_INIT:
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return get_nonce(message, &this->other_nonce);
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case CREATE_CHILD_SA:
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get_nonce(message, &this->other_nonce);
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break;
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case IKE_AUTH:
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if (message->get_payload(message, ID_INITIATOR) == NULL)
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{
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/* wait until extensible authentication completed, if used */
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return NEED_MORE;
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}
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default:
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break;
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}
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process_payloads(this, message);
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if (this->tsi == NULL || this->tsr == NULL)
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{
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DBG1(DBG_IKE, "TS payload missing in message");
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return NEED_MORE;
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}
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peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
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if (peer_cfg)
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{
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this->config = peer_cfg->select_child_cfg(peer_cfg, this->tsr, this->tsi,
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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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}
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.build for responder
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*/
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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;
|
|
case IKE_AUTH:
|
|
if (message->get_payload(message, EXTENSIBLE_AUTHENTICATION))
|
|
{
|
|
/* wait until extensible authentication completed, if used */
|
|
return NEED_MORE;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (this->ike_sa->get_state(this->ike_sa) == IKE_REKEYING)
|
|
{
|
|
SIG(CHILD_UP_FAILED, "unable to create CHILD_SA while rekeying IKE_SA");
|
|
message->add_notify(message, TRUE, NO_ADDITIONAL_SAS, chunk_empty);
|
|
return SUCCESS;
|
|
}
|
|
|
|
if (this->config == NULL)
|
|
{
|
|
SIG(CHILD_UP_FAILED, "traffic selectors %#R=== %#R inacceptable",
|
|
this->tsr, this->tsi);
|
|
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->config, 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;
|
|
|
|
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;
|
|
case IKE_AUTH:
|
|
if (message->get_payload(message, EXTENSIBLE_AUTHENTICATION))
|
|
{
|
|
/* wait until extensible authentication completed, if used */
|
|
return NEED_MORE;
|
|
}
|
|
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);
|
|
|
|
switch (type)
|
|
{
|
|
/* handle notify errors related to CHILD_SA only */
|
|
case NO_PROPOSAL_CHOSEN:
|
|
case SINGLE_PAIR_REQUIRED:
|
|
case NO_ADDITIONAL_SAS:
|
|
case INTERNAL_ADDRESS_FAILURE:
|
|
case FAILED_CP_REQUIRED:
|
|
case TS_UNACCEPTABLE:
|
|
case INVALID_SELECTORS:
|
|
{
|
|
SIG(CHILD_UP_FAILED, "received %N notify, no CHILD_SA built",
|
|
notify_type_names, type);
|
|
iterator->destroy(iterator);
|
|
/* an error in CHILD_SA creation is not critical */
|
|
return SUCCESS;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
iterator->destroy(iterator);
|
|
|
|
process_payloads(this, message);
|
|
|
|
if (select_and_install(this) == SUCCESS)
|
|
{
|
|
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 child_create_t.get_child
|
|
*/
|
|
static child_sa_t* get_child(private_child_create_t *this)
|
|
{
|
|
return this->child_sa;
|
|
}
|
|
|
|
/**
|
|
* Implementation of child_create_t.get_lower_nonce
|
|
*/
|
|
static chunk_t get_lower_nonce(private_child_create_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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
this->established = FALSE;
|
|
}
|
|
|
|
/**
|
|
* 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));
|
|
}
|
|
if (!this->established)
|
|
{
|
|
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->config);
|
|
free(this);
|
|
}
|
|
|
|
/*
|
|
* Described in header.
|
|
*/
|
|
child_create_t *child_create_create(ike_sa_t *ike_sa, child_cfg_t *config)
|
|
{
|
|
private_child_create_t *this = malloc_thing(private_child_create_t);
|
|
|
|
this->public.get_child = (child_sa_t*(*)(child_create_t*))get_child;
|
|
this->public.get_lower_nonce = (chunk_t(*)(child_create_t*))get_lower_nonce;
|
|
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 (config)
|
|
{
|
|
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;
|
|
config->get_ref(config);
|
|
}
|
|
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->config = config;
|
|
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;
|
|
this->established = FALSE;
|
|
|
|
return &this->public;
|
|
}
|