Task added for IKEv1 NAT detection.
There is already support for both Main and Aggressive Mode.
This commit is contained in:
parent
61e2a1ad8a
commit
1cc4ec46cf
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@ -85,6 +85,7 @@ sa/tasks/ike_delete.c sa/tasks/ike_delete.h \
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sa/tasks/ike_dpd.c sa/tasks/ike_dpd.h \
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sa/tasks/ike_init.c sa/tasks/ike_init.h \
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sa/tasks/ike_natd.c sa/tasks/ike_natd.h \
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sa/tasks/ike_natd_v1.c sa/tasks/ike_natd_v1.h \
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sa/tasks/ike_mobike.c sa/tasks/ike_mobike.h \
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sa/tasks/ike_rekey.c sa/tasks/ike_rekey.h \
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sa/tasks/ike_reauth.c sa/tasks/ike_reauth.h \
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@ -93,8 +94,9 @@ sa/tasks/ike_vendor.c sa/tasks/ike_vendor.h \
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sa/tasks/ike_vendor_v1.c sa/tasks/ike_vendor_v1.h \
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sa/tasks/main_mode.c sa/tasks/main_mode.h \
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sa/tasks/quick_mode.c sa/tasks/quick_mode.h \
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sa/tasks/task.c sa/tasks/task.h \
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sa/tasks/xauth_request.c sa/tasks/xauth_request.h
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sa/tasks/xauth_request.c sa/tasks/xauth_request.h \
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sa/tasks/task.c sa/tasks/task.h
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daemon.lo : $(top_builddir)/config.status
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@ -46,6 +46,7 @@
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#include <sa/tasks/child_rekey.h>
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#include <sa/tasks/main_mode.h>
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#include <sa/tasks/quick_mode.h>
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#include <sa/tasks/ike_natd_v1.h>
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#include <sa/tasks/ike_vendor_v1.h>
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#include <sa/tasks/xauth_request.h>
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#include <processing/jobs/retransmit_job.h>
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@ -1123,6 +1124,8 @@ METHOD(ike_sa_t, initiate, status_t,
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this->task_manager->queue_task(this->task_manager, task);
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task = (task_t*)main_mode_create(&this->public, TRUE);
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this->task_manager->queue_task(this->task_manager, task);
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task = (task_t*)ike_natd_v1_create(&this->public, TRUE);
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this->task_manager->queue_task(this->task_manager, task);
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}
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else
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{
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@ -19,10 +19,10 @@
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#include <math.h>
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#include <daemon.h>
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#include <sa/tasks/ike_vendor.h>
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#include <sa/tasks/main_mode.h>
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#include <sa/tasks/quick_mode.h>
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#include <sa/tasks/xauth_request.h>
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#include <sa/tasks/ike_natd_v1.h>
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#include <sa/tasks/ike_vendor_v1.h>
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#include <processing/jobs/retransmit_job.h>
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#include <processing/jobs/delete_ike_sa_job.h>
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@ -267,6 +267,7 @@ METHOD(task_manager_t, initiate, status_t,
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if (activate_task(this, TASK_MAIN_MODE))
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{
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exchange = ID_PROT;
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activate_task(this, TASK_IKE_NATD_V1);
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}
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break;
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case IKE_CONNECTING:
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@ -497,6 +498,8 @@ static status_t process_request(private_task_manager_t *this,
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this->passive_tasks->insert_last(this->passive_tasks, task);
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task = (task_t *)main_mode_create(this->ike_sa, FALSE);
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this->passive_tasks->insert_last(this->passive_tasks, task);
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task = (task_t *)ike_natd_v1_create(this->ike_sa, FALSE);
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this->passive_tasks->insert_last(this->passive_tasks, task);
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break;
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case AGGRESSIVE:
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/* TODO-IKEv1: agressive mode */
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@ -0,0 +1,440 @@
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/*
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* Copyright (C) 2006-2011 Tobias Brunner,
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* Copyright (C) 2006-2007 Martin Willi
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* Copyright (C) 2006 Daniel Roethlisberger
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "ike_natd_v1.h"
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#include <string.h>
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#include <hydra.h>
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#include <daemon.h>
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#include <sa/keymat_v1.h>
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#include <config/peer_cfg.h>
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#include <crypto/hashers/hasher.h>
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#include <encoding/payloads/hash_payload.h>
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typedef struct private_ike_natd_v1_t private_ike_natd_v1_t;
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/**
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* Private members of a ike_natt_t task.
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*/
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struct private_ike_natd_v1_t {
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/**
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* Public interface.
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*/
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ike_natd_v1_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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* Keymat derivation (from SA)
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*/
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keymat_v1_t *keymat;
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/**
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* Did we process any NAT detection payloads for a source address?
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*/
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bool src_seen;
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/**
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* Did we process any NAT detection payloads for a destination address?
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*/
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bool dst_seen;
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/**
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* Have we found a matching source address NAT hash?
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*/
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bool src_matched;
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/**
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* Have we found a matching destination address NAT hash?
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*/
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bool dst_matched;
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};
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/**
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* Build NAT detection hash for a host.
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*/
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static chunk_t generate_natd_hash(private_ike_natd_v1_t *this,
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ike_sa_id_t *ike_sa_id, host_t *host)
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{
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hasher_t *hasher;
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chunk_t natd_chunk, natd_hash;
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u_int64_t spi_i, spi_r;
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u_int16_t port;
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hasher = this->keymat->get_hasher(this->keymat);
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if (!hasher)
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{
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DBG1(DBG_IKE, "no hasher available to build NAT-D payload");
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return chunk_empty;
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}
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spi_i = ike_sa_id->get_initiator_spi(ike_sa_id);
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spi_r = ike_sa_id->get_responder_spi(ike_sa_id);
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port = htons(host->get_port(host));
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/* natd_hash = HASH(CKY-I | CKY-R | IP | Port) */
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natd_chunk = chunk_cata("cccc", chunk_from_thing(spi_i),
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chunk_from_thing(spi_r), host->get_address(host),
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chunk_from_thing(port));
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hasher->allocate_hash(hasher, natd_chunk, &natd_hash);
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DBG3(DBG_IKE, "natd_chunk %B", &natd_chunk);
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DBG3(DBG_IKE, "natd_hash %B", &natd_hash);
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return natd_hash;
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}
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/**
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* Build a faked NAT-D payload to enforce UDP encapsulation.
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*/
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static chunk_t generate_natd_hash_faked(private_ike_natd_v1_t *this)
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{
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hasher_t *hasher;
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chunk_t chunk;
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rng_t *rng;
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hasher = this->keymat->get_hasher(this->keymat);
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if (!hasher)
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{
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DBG1(DBG_IKE, "no hasher available to build NAT-D payload");
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return chunk_empty;
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}
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rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
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if (!rng)
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{
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DBG1(DBG_IKE, "unable to get random bytes for NAT-D fake");
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return chunk_empty;
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}
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rng->allocate_bytes(rng, hasher->get_hash_size(hasher), &chunk);
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rng->destroy(rng);
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return chunk;
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}
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/**
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* Build a NAT-D payload.
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*/
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static hash_payload_t *build_natd_payload(private_ike_natd_v1_t *this, bool src,
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host_t *host)
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{
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hash_payload_t *payload;
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ike_cfg_t *config;
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chunk_t hash;
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config = this->ike_sa->get_ike_cfg(this->ike_sa);
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if (src && config->force_encap(config))
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{
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hash = generate_natd_hash_faked(this);
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}
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else
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{
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ike_sa_id_t *ike_sa_id = this->ike_sa->get_id(this->ike_sa);
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hash = generate_natd_hash(this, ike_sa_id, host);
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}
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payload = hash_payload_create(NAT_D_V1);
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payload->set_hash(payload, hash);
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chunk_free(&hash);
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return payload;
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}
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/**
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* Add NAT-D payloads to the message.
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*/
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static void add_natd_payloads(private_ike_natd_v1_t *this, message_t *message)
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{
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hash_payload_t *payload;
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host_t *host;
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/* destination has to be added first */
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host = message->get_destination(message);
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payload = build_natd_payload(this, FALSE, host);
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message->add_payload(message, (payload_t*)payload);
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/* source is added second, compared with IKEv2 we always know the source,
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* as these payloads are added in the second Phase 1 exchange or the
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* response to the first */
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host = message->get_source(message);
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payload = build_natd_payload(this, TRUE, host);
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message->add_payload(message, (payload_t*)payload);
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}
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/**
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* Read NAT-D payloads from message and evaluate them.
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*/
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static void process_payloads(private_ike_natd_v1_t *this, message_t *message)
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{
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enumerator_t *enumerator;
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payload_t *payload;
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hash_payload_t *hash_payload;
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chunk_t hash, src_hash, dst_hash;
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ike_sa_id_t *ike_sa_id;
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host_t *me, *other;
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ike_cfg_t *config;
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/* precompute hashes for incoming NAT-D comparison */
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ike_sa_id = message->get_ike_sa_id(message);
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me = message->get_destination(message);
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other = message->get_source(message);
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dst_hash = generate_natd_hash(this, ike_sa_id, me);
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src_hash = generate_natd_hash(this, ike_sa_id, other);
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DBG3(DBG_IKE, "precalculated src_hash %B", &src_hash);
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DBG3(DBG_IKE, "precalculated dst_hash %B", &dst_hash);
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enumerator = message->create_payload_enumerator(message);
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while (enumerator->enumerate(enumerator, &payload))
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{
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if (payload->get_type(payload) != NAT_D_V1)
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{
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continue;
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}
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hash_payload = (hash_payload_t*)payload;
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if (!this->dst_seen)
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{ /* the first NAT-D payload contains the destination hash */
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this->dst_seen = TRUE;
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hash = hash_payload->get_hash(hash_payload);
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DBG3(DBG_IKE, "received dst_hash %B", &hash);
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if (chunk_equals(hash, dst_hash))
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{
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this->dst_matched = TRUE;
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}
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continue;
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}
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/* the other NAT-D payloads contain source hashes */
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this->src_seen = TRUE;
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if (!this->src_matched)
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{
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hash = hash_payload->get_hash(hash_payload);
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DBG3(DBG_IKE, "received src_hash %B", &hash);
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if (chunk_equals(hash, src_hash))
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{
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this->src_matched = TRUE;
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}
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}
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}
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enumerator->destroy(enumerator);
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chunk_free(&src_hash);
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chunk_free(&dst_hash);
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if (this->src_seen && this->dst_seen)
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{
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this->ike_sa->set_condition(this->ike_sa, COND_NAT_HERE,
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!this->dst_matched);
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this->ike_sa->set_condition(this->ike_sa, COND_NAT_THERE,
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!this->src_matched);
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config = this->ike_sa->get_ike_cfg(this->ike_sa);
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if (this->dst_matched && this->src_matched &&
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config->force_encap(config))
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{
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this->ike_sa->set_condition(this->ike_sa, COND_NAT_FAKE, TRUE);
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}
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}
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}
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METHOD(task_t, build_i, status_t,
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private_ike_natd_v1_t *this, message_t *message)
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{
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status_t result = NEED_MORE;
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switch (message->get_exchange_type(message))
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{
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case AGGRESSIVE:
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{ /* add NAT-D payloads to the second request, already processed
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* those by the responder contained in the first response */
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result = SUCCESS;
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/* fall */
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}
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case ID_PROT:
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{ /* add NAT-D payloads to the second request, need to process
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* those by the responder contained in the second response */
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if (message->get_payload(message, SECURITY_ASSOCIATION_V1))
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{ /* wait for the second exchange */
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return NEED_MORE;
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}
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add_natd_payloads(this, message);
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return result;
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}
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default:
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break;
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}
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return SUCCESS;
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}
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METHOD(task_t, process_i, status_t,
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private_ike_natd_v1_t *this, message_t *message)
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{
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status_t result = NEED_MORE;
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if (!this->ike_sa->supports_extension(this->ike_sa, EXT_NATT))
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{ /* we didn't receive VIDs inidcating support for NAT-T */
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return SUCCESS;
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}
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switch (message->get_exchange_type(message))
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{
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case ID_PROT:
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{ /* process NAT-D payloads in the second response, added them in the
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* second request already, so we're done afterwards */
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if (message->get_payload(message, SECURITY_ASSOCIATION_V1))
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{ /* wait for the second exchange */
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return NEED_MORE;
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}
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result = SUCCESS;
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/* fall */
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}
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case AGGRESSIVE:
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{ /* process NAT-D payloads in the first response, add them in the
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* following second request */
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process_payloads(this, message);
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if (this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY))
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{
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this->ike_sa->float_ports(this->ike_sa);
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}
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return result;
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}
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default:
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break;
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}
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return SUCCESS;
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}
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METHOD(task_t, process_r, status_t,
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private_ike_natd_v1_t *this, message_t *message)
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{
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status_t result = NEED_MORE;
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if (!this->ike_sa->supports_extension(this->ike_sa, EXT_NATT))
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{ /* we didn't receive VIDs indicating NAT-T support */
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return SUCCESS;
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}
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switch (message->get_exchange_type(message))
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{
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case AGGRESSIVE:
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{ /* proccess NAT-D payloads in the second request, already added ours
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* in the first response */
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result = SUCCESS;
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/* fall */
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}
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case ID_PROT:
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{ /* process NAT-D payloads in the second request, need to add ours
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* to the second response */
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if (message->get_payload(message, SECURITY_ASSOCIATION_V1))
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{ /* wait for the second exchange */
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return NEED_MORE;
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}
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process_payloads(this, message);
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return result;
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}
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default:
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break;
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}
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return SUCCESS;
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}
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METHOD(task_t, build_r, status_t,
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private_ike_natd_v1_t *this, message_t *message)
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{
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switch (message->get_exchange_type(message))
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{
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case ID_PROT:
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{ /* add NAT-D payloads to second response, already processed those
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* contained in the second request */
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if (message->get_payload(message, SECURITY_ASSOCIATION_V1))
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{ /* wait for the second exchange */
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return NEED_MORE;
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}
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add_natd_payloads(this, message);
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return SUCCESS;
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}
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case AGGRESSIVE:
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{ /* add NAT-D payloads to the first response, process those contained
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* in the following second request */
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add_natd_payloads(this, message);
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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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return SUCCESS;
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}
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METHOD(task_t, get_type, task_type_t,
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private_ike_natd_v1_t *this)
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{
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return TASK_IKE_NATD_V1;
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}
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METHOD(task_t, migrate, void,
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private_ike_natd_v1_t *this, ike_sa_t *ike_sa)
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{
|
||||
this->ike_sa = ike_sa;
|
||||
this->src_seen = FALSE;
|
||||
this->dst_seen = FALSE;
|
||||
this->src_matched = FALSE;
|
||||
this->dst_matched = FALSE;
|
||||
}
|
||||
|
||||
METHOD(task_t, destroy, void,
|
||||
private_ike_natd_v1_t *this)
|
||||
{
|
||||
free(this);
|
||||
}
|
||||
|
||||
/*
|
||||
* Described in header.
|
||||
*/
|
||||
ike_natd_v1_t *ike_natd_v1_create(ike_sa_t *ike_sa, bool initiator)
|
||||
{
|
||||
private_ike_natd_v1_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,
|
||||
);
|
||||
|
||||
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;
|
||||
}
|
|
@ -0,0 +1,50 @@
|
|||
/*
|
||||
* Copyright (C) 2011 Tobias Brunner
|
||||
* Hochschule fuer Technik Rapperswil
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the
|
||||
* Free Software Foundation; either version 2 of the License, or (at your
|
||||
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
||||
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
* for more details.
|
||||
*/
|
||||
|
||||
/**
|
||||
* @defgroup ike_natd_v1 ike_natd_v1
|
||||
* @{ @ingroup tasks
|
||||
*/
|
||||
|
||||
#ifndef IKE_NATD_V1_H_
|
||||
#define IKE_NATD_V1_H_
|
||||
|
||||
typedef struct ike_natd_v1_t ike_natd_v1_t;
|
||||
|
||||
#include <library.h>
|
||||
#include <sa/ike_sa.h>
|
||||
#include <sa/tasks/task.h>
|
||||
|
||||
/**
|
||||
* Task of type ike_natd_v1, detects NAT situation in IKEv1 Phase 1.
|
||||
*/
|
||||
struct ike_natd_v1_t {
|
||||
|
||||
/**
|
||||
* Implements the task_t interface
|
||||
*/
|
||||
task_t task;
|
||||
};
|
||||
|
||||
/**
|
||||
* Create a new ike_natd_v1 task.
|
||||
*
|
||||
* @param ike_sa IKE_SA this task works for
|
||||
* @param initiator TRUE if task is the original initiator
|
||||
* @return ike_natd_v1 task to handle by the task_manager
|
||||
*/
|
||||
ike_natd_v1_t *ike_natd_v1_create(ike_sa_t *ike_sa, bool initiator);
|
||||
|
||||
#endif /** IKE_NATD_V1_H_ @}*/
|
|
@ -38,6 +38,7 @@ ENUM(task_type_names, TASK_IKE_INIT, TASK_XAUTH_REQUEST,
|
|||
"MAIN_MODE",
|
||||
"QUICK_MODE",
|
||||
"VENDOR_V1",
|
||||
"IKE_NATD_V1",
|
||||
"XAUTH_REQUEST",
|
||||
);
|
||||
#else
|
||||
|
@ -61,6 +62,7 @@ ENUM(task_type_names, TASK_IKE_INIT, TASK_XAUTH_REQUEST,
|
|||
"MAIN_MODE",
|
||||
"QUICK_MODE",
|
||||
"VENDOR_V1",
|
||||
"IKE_NATD_V1",
|
||||
"XAUTH_REQUEST",
|
||||
);
|
||||
#endif /* ME */
|
||||
|
|
|
@ -75,6 +75,8 @@ enum task_type_t {
|
|||
TASK_QUICK_MODE,
|
||||
/** IKEv1 vendor ID payload handling */
|
||||
TASK_VENDOR_V1,
|
||||
/** IKEv1 NAT detection */
|
||||
TASK_IKE_NATD_V1,
|
||||
/** Request the user/pass with XAUTH */
|
||||
TASK_XAUTH_REQUEST,
|
||||
};
|
||||
|
|
Loading…
Reference in New Issue