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strongswan-ext/src/charon/plugins/ha_sync/ha_sync_dispatcher.c
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C

/*
* Copyright (C) 2008 Martin Willi
* 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.
*
* $Id$
*/
#include "ha_sync_dispatcher.h"
#include <daemon.h>
#include <processing/jobs/callback_job.h>
typedef struct private_ha_sync_dispatcher_t private_ha_sync_dispatcher_t;
/**
* Private data of an ha_sync_dispatcher_t object.
*/
struct private_ha_sync_dispatcher_t {
/**
* Public ha_sync_dispatcher_t interface.
*/
ha_sync_dispatcher_t public;
/**
* socket to pull messages from
*/
ha_sync_socket_t *socket;
/**
* Synced SA state cache
*/
ha_sync_cache_t *cache;
/**
* Dispatcher job
*/
callback_job_t *job;
};
/**
* Quick and dirty hack implementation of diffie_hellman_t.get_shared_secret
*/
static status_t get_shared_secret(diffie_hellman_t *this, chunk_t *secret)
{
*secret = chunk_clone((*(chunk_t*)this->destroy));
return SUCCESS;
}
/**
* Process messages of type IKE_ADD
*/
static void process_ike_add(private_ha_sync_dispatcher_t *this,
ha_sync_message_t *message)
{
ha_sync_message_attribute_t attribute;
ha_sync_message_value_t value;
enumerator_t *enumerator;
ike_sa_t *ike_sa = NULL, *old_sa = NULL;
u_int16_t encr = 0, len = 0, integ = 0, prf = 0, old_prf = PRF_UNDEFINED;
chunk_t nonce_i = chunk_empty, nonce_r = chunk_empty;
chunk_t secret = chunk_empty, old_skd = chunk_empty;
enumerator = message->create_attribute_enumerator(message);
while (enumerator->enumerate(enumerator, &attribute, &value))
{
switch (attribute)
{
case HA_SYNC_IKE_ID:
ike_sa = this->cache->get_ike_sa(this->cache, value.ike_sa_id);
DBG2(DBG_IKE, "got HA_SYNC_IKE_ADD: %llx:%llx - %p",
value.ike_sa_id->get_initiator_spi(value.ike_sa_id),
value.ike_sa_id->get_responder_spi(value.ike_sa_id),
ike_sa);
break;
case HA_SYNC_IKE_REKEY_ID:
old_sa = this->cache->get_ike_sa(this->cache, value.ike_sa_id);
break;
case HA_SYNC_NONCE_I:
nonce_i = value.chunk;
break;
case HA_SYNC_NONCE_R:
nonce_r = value.chunk;
break;
case HA_SYNC_SECRET:
secret = value.chunk;
break;
case HA_SYNC_OLD_SKD:
old_skd = value.chunk;
break;
case HA_SYNC_ALG_ENCR:
encr = value.u16;
break;
case HA_SYNC_ALG_ENCR_LEN:
len = value.u16;
break;
case HA_SYNC_ALG_INTEG:
integ = value.u16;
break;
case HA_SYNC_ALG_PRF:
prf = value.u16;
break;
case HA_SYNC_ALG_OLD_PRF:
old_prf = value.u16;
break;
default:
break;
}
}
enumerator->destroy(enumerator);
if (ike_sa)
{
proposal_t *proposal;
keymat_t *keymat;
/* quick and dirty hack of a DH implementation ;-) */
diffie_hellman_t dh = { .get_shared_secret = get_shared_secret,
.destroy = (void*)&secret };
proposal = proposal_create(PROTO_IKE);
keymat = ike_sa->get_keymat(ike_sa);
if (integ)
{
proposal->add_algorithm(proposal, INTEGRITY_ALGORITHM, integ, 0);
}
if (encr)
{
proposal->add_algorithm(proposal, ENCRYPTION_ALGORITHM, encr, len);
}
if (prf)
{
proposal->add_algorithm(proposal, PSEUDO_RANDOM_FUNCTION, prf, 0);
}
charon->bus->set_sa(charon->bus, ike_sa);
if (!keymat->derive_ike_keys(keymat, proposal, &dh, nonce_i, nonce_r,
ike_sa->get_id(ike_sa), old_prf, old_skd))
{
DBG1(DBG_IKE, "HA sync keymat derivation failed");
}
charon->bus->set_sa(charon->bus, NULL);
proposal->destroy(proposal);
if (old_sa)
{
ike_sa->inherit(ike_sa, old_sa);
this->cache->delete_ike_sa(this->cache, old_sa->get_id(old_sa));
}
}
}
/**
* Apply a condition flag to the IKE_SA if it is in set
*/
static void set_condition(ike_sa_t *ike_sa, ike_condition_t set,
ike_condition_t flag)
{
ike_sa->set_condition(ike_sa, flag, flag & set);
}
/**
* Apply a extension flag to the IKE_SA if it is in set
*/
static void set_extension(ike_sa_t *ike_sa, ike_extension_t set,
ike_extension_t flag)
{
if (flag & set)
{
ike_sa->enable_extension(ike_sa, flag);
}
}
/**
* Process messages of type IKE_UPDATE
*/
static void process_ike_update(private_ha_sync_dispatcher_t *this,
ha_sync_message_t *message)
{
ha_sync_message_attribute_t attribute;
ha_sync_message_value_t value;
enumerator_t *enumerator;
ike_sa_t *ike_sa = NULL;
peer_cfg_t *peer_cfg = NULL;
enumerator = message->create_attribute_enumerator(message);
while (enumerator->enumerate(enumerator, &attribute, &value))
{
if (attribute != HA_SYNC_IKE_ID && ike_sa == NULL)
{
DBG1(DBG_IKE, "HA_SYNC_IKE_ID must be first attribute");
break;
}
switch (attribute)
{
case HA_SYNC_IKE_ID:
ike_sa = this->cache->get_ike_sa(this->cache, value.ike_sa_id);
DBG2(DBG_IKE, "got HA_SYNC_IKE_UPDATE: %llx:%llx - %p",
value.ike_sa_id->get_initiator_spi(value.ike_sa_id),
value.ike_sa_id->get_responder_spi(value.ike_sa_id),
ike_sa);
break;
case HA_SYNC_LOCAL_ID:
ike_sa->set_my_id(ike_sa, value.id->clone(value.id));
break;
case HA_SYNC_REMOTE_ID:
ike_sa->set_other_id(ike_sa, value.id->clone(value.id));
break;
case HA_SYNC_EAP_ID:
ike_sa->set_eap_identity(ike_sa, value.id->clone(value.id));
break;
case HA_SYNC_LOCAL_ADDR:
ike_sa->set_my_host(ike_sa, value.host->clone(value.host));
break;
case HA_SYNC_REMOTE_ADDR:
ike_sa->set_other_host(ike_sa, value.host->clone(value.host));
break;
case HA_SYNC_LOCAL_VIP:
case HA_SYNC_REMOTE_VIP:
ike_sa->set_virtual_ip(ike_sa, attribute == HA_SYNC_LOCAL_VIP,
value.host->clone(value.host));
break;
case HA_SYNC_ADDITIONAL_ADDR:
ike_sa->add_additional_address(ike_sa,
value.host->clone(value.host));
break;
case HA_SYNC_CONFIG_NAME:
peer_cfg = charon->backends->get_peer_cfg_by_name(
charon->backends, value.str);
break;
case HA_SYNC_CONDITIONS:
set_condition(ike_sa, value.u32, EXT_NATT);
set_condition(ike_sa, value.u32, EXT_MOBIKE);
set_condition(ike_sa, value.u32, EXT_HASH_AND_URL);
break;
case HA_SYNC_EXTENSIONS:
set_extension(ike_sa, value.u32, COND_NAT_ANY);
set_extension(ike_sa, value.u32, COND_NAT_HERE);
set_extension(ike_sa, value.u32, COND_NAT_THERE);
set_extension(ike_sa, value.u32, COND_NAT_FAKE);
set_extension(ike_sa, value.u32, COND_EAP_AUTHENTICATED);
set_extension(ike_sa, value.u32, COND_CERTREQ_SEEN);
set_extension(ike_sa, value.u32, COND_ORIGINAL_INITIATOR);
break;
default:
break;
}
}
enumerator->destroy(enumerator);
if (peer_cfg)
{
ike_sa->set_peer_cfg(ike_sa, peer_cfg);
peer_cfg->destroy(peer_cfg);
charon->bus->set_sa(charon->bus, ike_sa);
/* we use the CONNECTING state to indicate sync is complete. */
/* TODO: add an additional HOT_COPY state? */
ike_sa->set_state(ike_sa, IKE_CONNECTING);
charon->bus->set_sa(charon->bus, NULL);
}
else
{
DBG1(DBG_IKE, "HA sync is missing nodes peer configuration");
}
}
/**
* Process messages of type IKE_DELETE
*/
static void process_ike_delete(private_ha_sync_dispatcher_t *this,
ha_sync_message_t *message)
{
ha_sync_message_attribute_t attribute;
ha_sync_message_value_t value;
enumerator_t *enumerator;
enumerator = message->create_attribute_enumerator(message);
while (enumerator->enumerate(enumerator, &attribute, &value))
{
switch (attribute)
{
case HA_SYNC_IKE_ID:
DBG2(DBG_IKE, "got HA_SYNC_IKE_DELETE: %llx:%llx",
value.ike_sa_id->get_initiator_spi(value.ike_sa_id),
value.ike_sa_id->get_responder_spi(value.ike_sa_id));
this->cache->delete_ike_sa(this->cache, value.ike_sa_id);
break;
default:
break;
}
}
enumerator->destroy(enumerator);
}
/**
* get the child_cfg with the same name as the peer cfg
*/
static child_cfg_t* find_child_cfg(char *name)
{
peer_cfg_t *peer_cfg;
child_cfg_t *current, *found = NULL;
enumerator_t *enumerator;
peer_cfg = charon->backends->get_peer_cfg_by_name(charon->backends, name);
if (peer_cfg)
{
enumerator = peer_cfg->create_child_cfg_enumerator(peer_cfg);
while (enumerator->enumerate(enumerator, &current))
{
if (streq(current->get_name(current), name))
{
found = current;
found->get_ref(found);
break;
}
}
enumerator->destroy(enumerator);
peer_cfg->destroy(peer_cfg);
}
return found;
}
/**
* Process messages of type CHILD_ADD
*/
static void process_child_add(private_ha_sync_dispatcher_t *this,
ha_sync_message_t *message)
{
ha_sync_message_attribute_t attribute;
ha_sync_message_value_t value;
enumerator_t *enumerator;
ike_sa_t *ike_sa = NULL;
child_cfg_t *config = NULL;
child_sa_t *child_sa;
proposal_t *proposal;
keymat_t *keymat;
bool initiator, failed = FALSE;
u_int32_t inbound_spi = 0, outbound_spi = 0;
u_int16_t inbound_cpi = 0, outbound_cpi = 0;
u_int8_t mode = MODE_TUNNEL, ipcomp = 0;
u_int16_t encr = ENCR_UNDEFINED, integ = AUTH_UNDEFINED, len = 0;
chunk_t nonce_i = chunk_empty, nonce_r = chunk_empty, secret = chunk_empty;
chunk_t encr_i, integ_i, encr_r, integ_r;
linked_list_t *local_ts, *remote_ts;
/* quick and dirty hack of a DH implementation */
diffie_hellman_t dh = { .get_shared_secret = get_shared_secret,
.destroy = (void*)&secret };
enumerator = message->create_attribute_enumerator(message);
while (enumerator->enumerate(enumerator, &attribute, &value))
{
switch (attribute)
{
case HA_SYNC_IKE_ID:
ike_sa = this->cache->get_ike_sa(this->cache, value.ike_sa_id);
initiator = value.ike_sa_id->is_initiator(value.ike_sa_id);
DBG2(DBG_CHD, "got HA_SYNC_CHILD_ADD: %llx:%llx - %p",
value.ike_sa_id->get_initiator_spi(value.ike_sa_id),
value.ike_sa_id->get_responder_spi(value.ike_sa_id),
ike_sa);
break;
case HA_SYNC_CONFIG_NAME:
config = find_child_cfg(value.str);
break;
case HA_SYNC_INBOUND_SPI:
inbound_spi = value.u32;
break;
case HA_SYNC_OUTBOUND_SPI:
outbound_spi = value.u32;
break;
case HA_SYNC_INBOUND_CPI:
inbound_cpi = value.u32;
break;
case HA_SYNC_OUTBOUND_CPI:
outbound_cpi = value.u32;
break;
case HA_SYNC_IPSEC_MODE:
mode = value.u8;
break;
case HA_SYNC_IPCOMP:
ipcomp = value.u8;
break;
case HA_SYNC_ALG_ENCR:
encr = value.u16;
break;
case HA_SYNC_ALG_ENCR_LEN:
len = value.u16;
break;
case HA_SYNC_ALG_INTEG:
integ = value.u16;
break;
case HA_SYNC_NONCE_I:
nonce_i = value.chunk;
break;
case HA_SYNC_NONCE_R:
nonce_r = value.chunk;
break;
case HA_SYNC_SECRET:
secret = value.chunk;
break;
default:
break;
}
}
enumerator->destroy(enumerator);
if (!config)
{
DBG1(DBG_CHD, "HA sync is missing nodes child configuration");
return;
}
if (!ike_sa)
{
config->destroy(config);
DBG1(DBG_CHD, "IKE_SA for HA sync CHILD_SA not found");
return;
}
charon->bus->set_sa(charon->bus, ike_sa);
child_sa = child_sa_create(ike_sa->get_my_host(ike_sa),
ike_sa->get_other_host(ike_sa), config, 0,
ike_sa->has_condition(ike_sa, COND_NAT_ANY));
config->destroy(config);
child_sa->set_mode(child_sa, mode);
child_sa->set_protocol(child_sa, PROTO_ESP);
child_sa->set_ipcomp(child_sa, ipcomp);
proposal = proposal_create(PROTO_ESP);
if (integ)
{
proposal->add_algorithm(proposal, INTEGRITY_ALGORITHM, integ, 0);
}
if (encr)
{
proposal->add_algorithm(proposal, ENCRYPTION_ALGORITHM, encr, len);
}
keymat = ike_sa->get_keymat(ike_sa);
if (!keymat->derive_child_keys(keymat, proposal, secret.ptr ? &dh : NULL,
nonce_i, nonce_r, &encr_i, &integ_i, &encr_r, &integ_r))
{
DBG1(DBG_CHD, "HA sync CHILD_SA key derivation failed");
child_sa->destroy(child_sa);
proposal->destroy(proposal);
charon->bus->set_sa(charon->bus, NULL);
return;
}
child_sa->set_proposal(child_sa, proposal);
child_sa->set_state(child_sa, CHILD_INSTALLING);
proposal->destroy(proposal);
if (initiator)
{
if (child_sa->install(child_sa, encr_r, integ_r,
inbound_spi, inbound_cpi, TRUE) != SUCCESS ||
child_sa->install(child_sa, encr_i, integ_i,
outbound_spi, outbound_cpi, FALSE) != SUCCESS)
{
failed = TRUE;
}
}
else
{
if (child_sa->install(child_sa, encr_i, integ_i,
inbound_spi, inbound_cpi, TRUE) != SUCCESS ||
child_sa->install(child_sa, encr_r, integ_r,
outbound_spi, outbound_cpi, FALSE) != SUCCESS)
{
failed = TRUE;
}
}
chunk_clear(&encr_i);
chunk_clear(&integ_i);
chunk_clear(&encr_r);
chunk_clear(&integ_r);
if (failed)
{
DBG1(DBG_CHD, "HA sync CHILD_SA installation failed");
child_sa->destroy(child_sa);
charon->bus->set_sa(charon->bus, NULL);
return;
}
/* TODO: Change CHILD_SA API to avoid cloning twice */
local_ts = linked_list_create();
remote_ts = linked_list_create();
enumerator = message->create_attribute_enumerator(message);
while (enumerator->enumerate(enumerator, &attribute, &value))
{
switch (attribute)
{
case HA_SYNC_LOCAL_TS:
local_ts->insert_last(local_ts, value.ts->clone(value.ts));
break;
case HA_SYNC_REMOTE_TS:
remote_ts->insert_last(remote_ts, value.ts->clone(value.ts));
break;
default:
break;
}
}
enumerator->destroy(enumerator);
child_sa->add_policies(child_sa, local_ts, remote_ts);
local_ts->destroy_offset(local_ts, offsetof(traffic_selector_t, destroy));
remote_ts->destroy_offset(remote_ts, offsetof(traffic_selector_t, destroy));
child_sa->set_state(child_sa, CHILD_INSTALLED);
ike_sa->add_child_sa(ike_sa, child_sa);
charon->bus->set_sa(charon->bus, NULL);
}
/**
* Process messages of type CHILD_DELETE
*/
static void process_child_delete(private_ha_sync_dispatcher_t *this,
ha_sync_message_t *message)
{
ha_sync_message_attribute_t attribute;
ha_sync_message_value_t value;
enumerator_t *enumerator;
ike_sa_t *ike_sa = NULL;
enumerator = message->create_attribute_enumerator(message);
while (enumerator->enumerate(enumerator, &attribute, &value))
{
switch (attribute)
{
case HA_SYNC_IKE_ID:
if (this->cache->has_ike_sa(this->cache, value.ike_sa_id))
{
ike_sa = this->cache->get_ike_sa(this->cache, value.ike_sa_id);
DBG2(DBG_CHD, "got HA_SYNC_CHILD_DELETE: %llx:%llx - %p",
value.ike_sa_id->get_initiator_spi(value.ike_sa_id),
value.ike_sa_id->get_responder_spi(value.ike_sa_id),
ike_sa);
continue;
}
break;
case HA_SYNC_INBOUND_SPI:
if (!ike_sa || ike_sa->destroy_child_sa(ike_sa, PROTO_ESP,
value.u32) != SUCCESS)
{
DBG1(DBG_CHD, "HA sync CHILD_SA 0x%lx delete failed (%p)",
value.u32, ike_sa);
}
break;
default:
break;
}
break;
}
enumerator->destroy(enumerator);
}
/**
* Dispatcher job function
*/
static job_requeue_t dispatch(private_ha_sync_dispatcher_t *this)
{
ha_sync_message_t *message;
message = this->socket->pull(this->socket);
switch (message->get_type(message))
{
case HA_SYNC_IKE_ADD:
process_ike_add(this, message);
break;
case HA_SYNC_IKE_UPDATE:
process_ike_update(this, message);
break;
case HA_SYNC_IKE_DELETE:
process_ike_delete(this, message);
break;
case HA_SYNC_CHILD_ADD:
process_child_add(this, message);
break;
case HA_SYNC_CHILD_DELETE:
process_child_delete(this, message);
break;
default:
DBG1(DBG_CFG, "received unknown HA sync message type %d",
message->get_type(message));
break;
}
message->destroy(message);
return JOB_REQUEUE_DIRECT;
}
/**
* Implementation of ha_sync_dispatcher_t.destroy.
*/
static void destroy(private_ha_sync_dispatcher_t *this)
{
this->job->cancel(this->job);
free(this);
}
/**
* See header
*/
ha_sync_dispatcher_t *ha_sync_dispatcher_create(ha_sync_socket_t *socket,
ha_sync_cache_t *cache)
{
private_ha_sync_dispatcher_t *this = malloc_thing(private_ha_sync_dispatcher_t);
this->public.destroy = (void(*)(ha_sync_dispatcher_t*))destroy;
this->socket = socket;
this->cache = cache;
this->job = callback_job_create((callback_job_cb_t)dispatch,
this, NULL, NULL);
charon->processor->queue_job(charon->processor, (job_t*)this->job);
return &this->public;
}