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strongswan/src/libcharon/sa/ikev2/task_manager_v2.c

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/*
* Copyright (C) 2007-2018 Tobias Brunner
* Copyright (C) 2007-2010 Martin Willi
* HSR 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.
*/
#include "task_manager_v2.h"
#include <math.h>
#include <collections/array.h>
#include <daemon.h>
#include <sa/ikev2/tasks/ike_init.h>
#include <sa/ikev2/tasks/ike_natd.h>
#include <sa/ikev2/tasks/ike_mobike.h>
#include <sa/ikev2/tasks/ike_auth.h>
#include <sa/ikev2/tasks/ike_auth_lifetime.h>
#include <sa/ikev2/tasks/ike_cert_pre.h>
#include <sa/ikev2/tasks/ike_cert_post.h>
#include <sa/ikev2/tasks/ike_rekey.h>
#include <sa/ikev2/tasks/ike_reauth.h>
#include <sa/ikev2/tasks/ike_reauth_complete.h>
#include <sa/ikev2/tasks/ike_redirect.h>
#include <sa/ikev2/tasks/ike_delete.h>
#include <sa/ikev2/tasks/ike_config.h>
#include <sa/ikev2/tasks/ike_dpd.h>
#include <sa/ikev2/tasks/ike_mid_sync.h>
#include <sa/ikev2/tasks/ike_vendor.h>
#include <sa/ikev2/tasks/ike_verify_peer_cert.h>
#include <sa/ikev2/tasks/child_create.h>
#include <sa/ikev2/tasks/child_rekey.h>
#include <sa/ikev2/tasks/child_delete.h>
#include <encoding/payloads/delete_payload.h>
#include <encoding/payloads/unknown_payload.h>
#include <processing/jobs/retransmit_job.h>
#include <processing/jobs/delete_ike_sa_job.h>
#include <processing/jobs/initiate_tasks_job.h>
#ifdef ME
#include <sa/ikev2/tasks/ike_me.h>
#endif
typedef struct private_task_manager_t private_task_manager_t;
typedef struct queued_task_t queued_task_t;
/**
* private data of the task manager
*/
struct private_task_manager_t {
/**
* public functions
*/
task_manager_v2_t public;
/**
* associated IKE_SA we are serving
*/
ike_sa_t *ike_sa;
/**
* Exchange we are currently handling as responder
*/
struct {
/**
* Message ID of the exchange
*/
uint32_t mid;
/**
* packet(s) for retransmission
*/
array_t *packets;
/**
* Helper to defragment the request
*/
message_t *defrag;
} responding;
/**
* Exchange we are currently handling as initiator
*/
struct {
/**
* Message ID of the exchange
*/
uint32_t mid;
/**
* how many times we have retransmitted so far
*/
u_int retransmitted;
/**
* packet(s) for retransmission
*/
array_t *packets;
/**
* type of the initiated exchange
*/
exchange_type_t type;
/**
* TRUE if exchange was deferred because no path was available
*/
bool deferred;
/**
* Helper to defragment the response
*/
message_t *defrag;
} initiating;
/**
* Array of queued tasks not yet in action
*/
array_t *queued_tasks;
/**
* Array of active tasks, initiated by ourselves
*/
array_t *active_tasks;
/**
* Array of tasks initiated by peer
*/
array_t *passive_tasks;
/**
* the task manager has been reset
*/
bool reset;
/**
* Number of times we retransmit messages before giving up
*/
u_int retransmit_tries;
/**
* Maximum number of tries possible with current retransmission settings
* before overflowing the range of uint32_t, which we use for the timeout.
* Note that UINT32_MAX milliseconds equal nearly 50 days, so that doesn't
* make much sense without retransmit_limit anyway.
*/
u_int retransmit_tries_max;
/**
* Retransmission timeout
*/
double retransmit_timeout;
/**
* Base to calculate retransmission timeout
*/
double retransmit_base;
/**
* Jitter to apply to calculated retransmit timeout (in percent)
*/
u_int retransmit_jitter;
/**
* Limit retransmit timeout to this value
*/
uint32_t retransmit_limit;
/**
* Use make-before-break instead of break-before-make reauth?
*/
bool make_before_break;
};
/**
* Queued tasks
*/
struct queued_task_t {
/**
* Queued task
*/
task_t *task;
/**
* Time before which the task is not to be initiated
*/
timeval_t time;
};
/**
* Reset retransmission packet list
*/
static void clear_packets(array_t *array)
{
packet_t *packet;
while (array_remove(array, ARRAY_TAIL, &packet))
{
packet->destroy(packet);
}
}
METHOD(task_manager_t, flush_queue, void,
private_task_manager_t *this, task_queue_t queue)
{
array_t *array;
task_t *task;
switch (queue)
{
case TASK_QUEUE_ACTIVE:
array = this->active_tasks;
break;
case TASK_QUEUE_PASSIVE:
array = this->passive_tasks;
break;
case TASK_QUEUE_QUEUED:
array = this->queued_tasks;
break;
default:
return;
}
while (array_remove(array, ARRAY_TAIL, &task))
{
if (queue == TASK_QUEUE_QUEUED)
{
queued_task_t *queued = (queued_task_t*)task;
task = queued->task;
free(queued);
}
task->destroy(task);
}
}
METHOD(task_manager_t, flush, void,
private_task_manager_t *this)
{
flush_queue(this, TASK_QUEUE_QUEUED);
flush_queue(this, TASK_QUEUE_PASSIVE);
flush_queue(this, TASK_QUEUE_ACTIVE);
}
/**
* Move a task of a specific type from the queue to the active list, if it is
* not delayed.
*/
static bool activate_task(private_task_manager_t *this, task_type_t type)
{
enumerator_t *enumerator;
queued_task_t *queued;
timeval_t now;
bool found = FALSE;
time_monotonic(&now);
enumerator = array_create_enumerator(this->queued_tasks);
while (enumerator->enumerate(enumerator, (void**)&queued))
{
if (queued->task->get_type(queued->task) == type &&
!timercmp(&now, &queued->time, <))
{
DBG2(DBG_IKE, " activating %N task", task_type_names, type);
array_remove_at(this->queued_tasks, enumerator);
array_insert(this->active_tasks, ARRAY_TAIL, queued->task);
free(queued);
found = TRUE;
break;
}
}
enumerator->destroy(enumerator);
return found;
}
/**
* Send packets in the given array (they get cloned). Optionally, the
* source and destination addresses are changed before sending it.
*/
static void send_packets(private_task_manager_t *this, array_t *packets,
host_t *src, host_t *dst)
{
packet_t *packet, *clone;
int i;
for (i = 0; i < array_count(packets); i++)
{
array_get(packets, i, &packet);
clone = packet->clone(packet);
if (src)
{
clone->set_source(clone, src->clone(src));
}
if (dst)
{
clone->set_destination(clone, dst->clone(dst));
}
charon->sender->send(charon->sender, clone);
}
}
/**
* Generates the given message and stores packet(s) in the given array
*/
static bool generate_message(private_task_manager_t *this, message_t *message,
array_t **packets)
{
enumerator_t *fragments;
packet_t *fragment;
if (this->ike_sa->generate_message_fragmented(this->ike_sa, message,
&fragments) != SUCCESS)
{
return FALSE;
}
while (fragments->enumerate(fragments, &fragment))
{
array_insert_create(packets, ARRAY_TAIL, fragment);
}
fragments->destroy(fragments);
array_compress(*packets);
return TRUE;
}
METHOD(task_manager_t, retransmit, status_t,
private_task_manager_t *this, uint32_t message_id)
{
if (message_id == this->initiating.mid &&
array_count(this->initiating.packets))
{
uint32_t timeout = UINT32_MAX, max_jitter;
job_t *job;
enumerator_t *enumerator;
packet_t *packet;
task_t *task;
ike_mobike_t *mobike = NULL;
array_get(this->initiating.packets, 0, &packet);
/* check if we are retransmitting a MOBIKE routability check */
if (this->initiating.type == INFORMATIONAL)
{
enumerator = array_create_enumerator(this->active_tasks);
while (enumerator->enumerate(enumerator, (void*)&task))
{
if (task->get_type(task) == TASK_IKE_MOBIKE)
{
mobike = (ike_mobike_t*)task;
break;
}
}
enumerator->destroy(enumerator);
}
if (!mobike || !mobike->is_probing(mobike))
{
if (this->initiating.retransmitted > this->retransmit_tries)
{
DBG1(DBG_IKE, "giving up after %d retransmits",
this->initiating.retransmitted - 1);
charon->bus->alert(charon->bus, ALERT_RETRANSMIT_SEND_TIMEOUT,
packet);
return DESTROY_ME;
}
if (this->retransmit_tries_max &&
this->initiating.retransmitted <= this->retransmit_tries_max)
{
timeout = (uint32_t)(this->retransmit_timeout * 1000.0 *
pow(this->retransmit_base, this->initiating.retransmitted));
}
if (this->retransmit_limit)
{
timeout = min(timeout, this->retransmit_limit);
}
if (this->retransmit_jitter)
{
max_jitter = (timeout / 100.0) * this->retransmit_jitter;
timeout -= max_jitter * (random() / (RAND_MAX + 1.0));
}
if (this->initiating.retransmitted)
{
DBG1(DBG_IKE, "retransmit %d of request with message ID %d",
this->initiating.retransmitted, message_id);
charon->bus->alert(charon->bus, ALERT_RETRANSMIT_SEND, packet,
this->initiating.retransmitted);
}
if (!mobike)
{
send_packets(this, this->initiating.packets,
this->ike_sa->get_my_host(this->ike_sa),
this->ike_sa->get_other_host(this->ike_sa));
}
else
{
if (!mobike->transmit(mobike, packet))
{
DBG1(DBG_IKE, "no route found to reach peer, MOBIKE update "
"deferred");
this->ike_sa->set_condition(this->ike_sa, COND_STALE, TRUE);
this->initiating.deferred = TRUE;
return SUCCESS;
}
else if (mobike->is_probing(mobike))
{
timeout = ROUTABILITY_CHECK_INTERVAL;
}
}
}
else
{ /* for routability checks, we use a more aggressive behavior */
if (this->initiating.retransmitted <= ROUTABILITY_CHECK_TRIES)
{
timeout = ROUTABILITY_CHECK_INTERVAL;
}
else
{
DBG1(DBG_IKE, "giving up after %d path probings",
this->initiating.retransmitted - 1);
return DESTROY_ME;
}
if (this->initiating.retransmitted)
{
DBG1(DBG_IKE, "path probing attempt %d",
this->initiating.retransmitted);
}
/* TODO-FRAG: presumably these small packets are not fragmented,
* we should maybe ensure this is the case when generating them */
if (!mobike->transmit(mobike, packet))
{
DBG1(DBG_IKE, "no route found to reach peer, path probing "
"deferred");
this->ike_sa->set_condition(this->ike_sa, COND_STALE, TRUE);
this->initiating.deferred = TRUE;
return SUCCESS;
}
}
this->initiating.retransmitted++;
job = (job_t*)retransmit_job_create(this->initiating.mid,
this->ike_sa->get_id(this->ike_sa));
lib->scheduler->schedule_job_ms(lib->scheduler, job, timeout);
}
return SUCCESS;
}
METHOD(task_manager_t, initiate, status_t,
private_task_manager_t *this)
{
enumerator_t *enumerator;
task_t *task;
message_t *message;
host_t *me, *other;
exchange_type_t exchange = 0;
if (this->initiating.type != EXCHANGE_TYPE_UNDEFINED)
{
DBG2(DBG_IKE, "delaying task initiation, %N exchange in progress",
exchange_type_names, this->initiating.type);
/* do not initiate if we already have a message in the air */
if (this->initiating.deferred)
{ /* re-initiate deferred exchange */
this->initiating.deferred = FALSE;
this->initiating.retransmitted = 0;
return retransmit(this, this->initiating.mid);
}
return SUCCESS;
}
if (array_count(this->active_tasks) == 0)
{
DBG2(DBG_IKE, "activating new tasks");
switch (this->ike_sa->get_state(this->ike_sa))
{
case IKE_CREATED:
activate_task(this, TASK_IKE_VENDOR);
if (activate_task(this, TASK_IKE_INIT))
{
this->initiating.mid = 0;
exchange = IKE_SA_INIT;
activate_task(this, TASK_IKE_NATD);
activate_task(this, TASK_IKE_CERT_PRE);
#ifdef ME
/* this task has to be activated before the TASK_IKE_AUTH
* task, because that task pregenerates the packet after
* which no payloads can be added to the message anymore.
*/
activate_task(this, TASK_IKE_ME);
#endif /* ME */
activate_task(this, TASK_IKE_AUTH);
activate_task(this, TASK_IKE_CERT_POST);
activate_task(this, TASK_IKE_CONFIG);
activate_task(this, TASK_CHILD_CREATE);
activate_task(this, TASK_IKE_AUTH_LIFETIME);
activate_task(this, TASK_IKE_MOBIKE);
}
break;
case IKE_ESTABLISHED:
if (activate_task(this, TASK_IKE_MOBIKE))
{
exchange = INFORMATIONAL;
break;
}
if (activate_task(this, TASK_IKE_DELETE))
{
exchange = INFORMATIONAL;
break;
}
if (activate_task(this, TASK_IKE_REDIRECT))
{
exchange = INFORMATIONAL;
break;
}
if (activate_task(this, TASK_CHILD_DELETE))
{
exchange = INFORMATIONAL;
break;
}
if (activate_task(this, TASK_IKE_REAUTH))
{
exchange = INFORMATIONAL;
break;
}
if (activate_task(this, TASK_CHILD_CREATE))
{
exchange = CREATE_CHILD_SA;
break;
}
if (activate_task(this, TASK_CHILD_REKEY))
{
exchange = CREATE_CHILD_SA;
break;
}
if (activate_task(this, TASK_IKE_REKEY))
{
exchange = CREATE_CHILD_SA;
break;
}
if (activate_task(this, TASK_IKE_DPD))
{
exchange = INFORMATIONAL;
break;
}
if (activate_task(this, TASK_IKE_AUTH_LIFETIME))
{
exchange = INFORMATIONAL;
break;
}
#ifdef ME
if (activate_task(this, TASK_IKE_ME))
{
exchange = ME_CONNECT;
break;
}
#endif /* ME */
if (activate_task(this, TASK_IKE_REAUTH_COMPLETE))
{
exchange = INFORMATIONAL;
break;
}
if (activate_task(this, TASK_IKE_VERIFY_PEER_CERT))
{
exchange = INFORMATIONAL;
break;
}
case IKE_REKEYING:
case IKE_REKEYED:
if (activate_task(this, TASK_IKE_DELETE))
{
exchange = INFORMATIONAL;
break;
}
case IKE_DELETING:
default:
break;
}
}
else
{
DBG2(DBG_IKE, "reinitiating already active tasks");
enumerator = array_create_enumerator(this->active_tasks);
while (enumerator->enumerate(enumerator, &task))
{
DBG2(DBG_IKE, " %N task", task_type_names, task->get_type(task));
switch (task->get_type(task))
{
case TASK_IKE_INIT:
exchange = IKE_SA_INIT;
break;
case TASK_IKE_AUTH:
exchange = IKE_AUTH;
break;
case TASK_CHILD_CREATE:
case TASK_CHILD_REKEY:
case TASK_IKE_REKEY:
exchange = CREATE_CHILD_SA;
break;
case TASK_IKE_MOBIKE:
exchange = INFORMATIONAL;
break;
default:
continue;
}
break;
}
enumerator->destroy(enumerator);
}
if (exchange == 0)
{
DBG2(DBG_IKE, "nothing to initiate");
/* nothing to do yet... */
return SUCCESS;
}
me = this->ike_sa->get_my_host(this->ike_sa);
other = this->ike_sa->get_other_host(this->ike_sa);
message = message_create(IKEV2_MAJOR_VERSION, IKEV2_MINOR_VERSION);
message->set_message_id(message, this->initiating.mid);
message->set_source(message, me->clone(me));
message->set_destination(message, other->clone(other));
message->set_exchange_type(message, exchange);
this->initiating.type = exchange;
this->initiating.retransmitted = 0;
this->initiating.deferred = FALSE;
enumerator = array_create_enumerator(this->active_tasks);
while (enumerator->enumerate(enumerator, &task))
{
switch (task->build(task, message))
{
case SUCCESS:
/* task completed, remove it */
array_remove_at(this->active_tasks, enumerator);
task->destroy(task);
break;
case NEED_MORE:
/* processed, but task needs another exchange */
break;
case FAILED:
default:
this->initiating.type = EXCHANGE_TYPE_UNDEFINED;
if (this->ike_sa->get_state(this->ike_sa) != IKE_CONNECTING &&
this->ike_sa->get_state(this->ike_sa) != IKE_REKEYED)
{
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
}
/* FALL */
case DESTROY_ME:
/* critical failure, destroy IKE_SA */
enumerator->destroy(enumerator);
message->destroy(message);
flush(this);
return DESTROY_ME;
}
}
enumerator->destroy(enumerator);
/* update exchange type if a task changed it */
this->initiating.type = message->get_exchange_type(message);
if (this->initiating.type == EXCHANGE_TYPE_UNDEFINED)
{
message->destroy(message);
return initiate(this);
}
if (!generate_message(this, message, &this->initiating.packets))
{
/* message generation failed. There is nothing more to do than to
* close the SA */
message->destroy(message);
flush(this);
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
return DESTROY_ME;
}
message->destroy(message);
array_compress(this->active_tasks);
array_compress(this->queued_tasks);
return retransmit(this, this->initiating.mid);
}
/**
* handle an incoming response message
*/
static status_t process_response(private_task_manager_t *this,
message_t *message)
{
enumerator_t *enumerator;
task_t *task;
if (message->get_exchange_type(message) != this->initiating.type)
{
DBG1(DBG_IKE, "received %N response, but expected %N",
exchange_type_names, message->get_exchange_type(message),
exchange_type_names, this->initiating.type);
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
return DESTROY_ME;
}
/* handle fatal INVALID_SYNTAX notifies */
switch (message->get_exchange_type(message))
{
case CREATE_CHILD_SA:
case INFORMATIONAL:
if (message->get_notify(message, INVALID_SYNTAX))
{
DBG1(DBG_IKE, "received %N notify error, destroying IKE_SA",
notify_type_names, INVALID_SYNTAX);
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
return DESTROY_ME;
}
break;
default:
break;
}
enumerator = array_create_enumerator(this->active_tasks);
while (enumerator->enumerate(enumerator, &task))
{
if (!task->pre_process)
{
continue;
}
switch (task->pre_process(task, message))
{
case SUCCESS:
break;
case FAILED:
default:
/* just ignore the message */
DBG1(DBG_IKE, "ignore invalid %N response",
exchange_type_names, message->get_exchange_type(message));
enumerator->destroy(enumerator);
return SUCCESS;
case DESTROY_ME:
/* critical failure, destroy IKE_SA */
enumerator->destroy(enumerator);
return DESTROY_ME;
}
}
enumerator->destroy(enumerator);
if (this->initiating.retransmitted > 1)
{
packet_t *packet = NULL;
array_get(this->initiating.packets, 0, &packet);
charon->bus->alert(charon->bus, ALERT_RETRANSMIT_SEND_CLEARED, packet);
}
/* catch if we get reset while processing */
this->reset = FALSE;
enumerator = array_create_enumerator(this->active_tasks);
while (enumerator->enumerate(enumerator, &task))
{
switch (task->process(task, message))
{
case SUCCESS:
/* task completed, remove it */
array_remove_at(this->active_tasks, enumerator);
task->destroy(task);
break;
case NEED_MORE:
/* processed, but task needs another exchange */
break;
case FAILED:
default:
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
/* FALL */
case DESTROY_ME:
/* critical failure, destroy IKE_SA */
array_remove_at(this->active_tasks, enumerator);
enumerator->destroy(enumerator);
task->destroy(task);
return DESTROY_ME;
}
if (this->reset)
{ /* start all over again if we were reset */
this->reset = FALSE;
enumerator->destroy(enumerator);
return initiate(this);
}
}
enumerator->destroy(enumerator);
this->initiating.mid++;
this->initiating.type = EXCHANGE_TYPE_UNDEFINED;
clear_packets(this->initiating.packets);
array_compress(this->active_tasks);
return initiate(this);
}
/**
* handle exchange collisions
*/
static bool handle_collisions(private_task_manager_t *this, task_t *task)
{
enumerator_t *enumerator;
task_t *active;
task_type_t type;
type = task->get_type(task);
/* do we have to check */
if (type == TASK_IKE_REKEY || type == TASK_CHILD_REKEY ||
type == TASK_CHILD_DELETE || type == TASK_IKE_DELETE)
{
/* find an exchange collision, and notify these tasks */
enumerator = array_create_enumerator(this->active_tasks);
while (enumerator->enumerate(enumerator, &active))
{
switch (active->get_type(active))
{
case TASK_IKE_REKEY:
if (type == TASK_IKE_REKEY || type == TASK_IKE_DELETE)
{
ike_rekey_t *rekey = (ike_rekey_t*)active;
rekey->collide(rekey, task);
break;
}
continue;
case TASK_CHILD_REKEY:
if (type == TASK_CHILD_REKEY || type == TASK_CHILD_DELETE)
{
child_rekey_t *rekey = (child_rekey_t*)active;
rekey->collide(rekey, task);
break;
}
continue;
default:
continue;
}
enumerator->destroy(enumerator);
return TRUE;
}
enumerator->destroy(enumerator);
}
return FALSE;
}
/**
* build a response depending on the "passive" task list
*/
static status_t build_response(private_task_manager_t *this, message_t *request)
{
enumerator_t *enumerator;
task_t *task;
message_t *message;
host_t *me, *other;
bool delete = FALSE, hook = FALSE, mid_sync = FALSE;
ike_sa_id_t *id = NULL;
uint64_t responder_spi = 0;
bool result;
me = request->get_destination(request);
other = request->get_source(request);
message = message_create(IKEV2_MAJOR_VERSION, IKEV2_MINOR_VERSION);
message->set_exchange_type(message, request->get_exchange_type(request));
/* send response along the path the request came in */
message->set_source(message, me->clone(me));
message->set_destination(message, other->clone(other));
message->set_message_id(message, this->responding.mid);
message->set_request(message, FALSE);
enumerator = array_create_enumerator(this->passive_tasks);
while (enumerator->enumerate(enumerator, (void*)&task))
{
if (task->get_type(task) == TASK_IKE_MID_SYNC)
{
mid_sync = TRUE;
}
switch (task->build(task, message))
{
case SUCCESS:
/* task completed, remove it */
array_remove_at(this->passive_tasks, enumerator);
if (!handle_collisions(this, task))
{
task->destroy(task);
}
break;
case NEED_MORE:
/* processed, but task needs another exchange */
if (handle_collisions(this, task))
{
array_remove_at(this->passive_tasks, enumerator);
}
break;
case FAILED:
default:
hook = TRUE;
/* FALL */
case DESTROY_ME:
/* destroy IKE_SA, but SEND response first */
if (handle_collisions(this, task))
{
array_remove_at(this->passive_tasks, enumerator);
}
delete = TRUE;
break;
}
if (delete)
{
break;
}
}
enumerator->destroy(enumerator);
/* RFC 5996, section 2.6 mentions that in the event of a failure during
* IKE_SA_INIT the responder's SPI will be 0 in the response, while it
* actually explicitly allows it to be non-zero. Since we use the responder
* SPI to create hashes in the IKE_SA manager we can only set the SPI to
* zero temporarily, otherwise checking the SA in would fail. */
if (delete && request->get_exchange_type(request) == IKE_SA_INIT)
{
id = this->ike_sa->get_id(this->ike_sa);
responder_spi = id->get_responder_spi(id);
id->set_responder_spi(id, 0);
}
/* message complete, send it */
clear_packets(this->responding.packets);
result = generate_message(this, message, &this->responding.packets);
message->destroy(message);
if (id)
{
id->set_responder_spi(id, responder_spi);
}
if (!result)
{
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
return DESTROY_ME;
}
send_packets(this, this->responding.packets, NULL, NULL);
if (delete)
{
if (hook)
{
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
}
return DESTROY_ME;
}
else if (mid_sync)
{
/* we don't want to resend messages to sync MIDs if requests with the
* previous MID arrive */
clear_packets(this->responding.packets);
/* avoid increasing the expected message ID after handling a message
* to sync MIDs with MID 0 */
return NEED_MORE;
}
array_compress(this->passive_tasks);
return SUCCESS;
}
/**
* handle an incoming request message
*/
static status_t process_request(private_task_manager_t *this,
message_t *message)
{
enumerator_t *enumerator;
task_t *task = NULL;
payload_t *payload;
notify_payload_t *notify;
delete_payload_t *delete;
ike_sa_state_t state;
if (array_count(this->passive_tasks) == 0)
{ /* create tasks depending on request type, if not already some queued */
state = this->ike_sa->get_state(this->ike_sa);
switch (message->get_exchange_type(message))
{
case IKE_SA_INIT:
{
task = (task_t*)ike_vendor_create(this->ike_sa, FALSE);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
task = (task_t*)ike_init_create(this->ike_sa, FALSE, NULL);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
task = (task_t*)ike_natd_create(this->ike_sa, FALSE);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
task = (task_t*)ike_cert_pre_create(this->ike_sa, FALSE);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
#ifdef ME
task = (task_t*)ike_me_create(this->ike_sa, FALSE);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
#endif /* ME */
task = (task_t*)ike_auth_create(this->ike_sa, FALSE);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
task = (task_t*)ike_cert_post_create(this->ike_sa, FALSE);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
task = (task_t*)ike_config_create(this->ike_sa, FALSE);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
task = (task_t*)child_create_create(this->ike_sa, NULL, FALSE,
NULL, NULL);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
task = (task_t*)ike_auth_lifetime_create(this->ike_sa, FALSE);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
task = (task_t*)ike_mobike_create(this->ike_sa, FALSE);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
break;
}
case CREATE_CHILD_SA:
{ /* FIXME: we should prevent this on mediation connections */
bool notify_found = FALSE, ts_found = FALSE;
if (state == IKE_CREATED ||
state == IKE_CONNECTING)
{
DBG1(DBG_IKE, "received CREATE_CHILD_SA request for "
"unestablished IKE_SA, rejected");
return FAILED;
}
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
switch (payload->get_type(payload))
{
case PLV2_NOTIFY:
{ /* if we find a rekey notify, its CHILD_SA rekeying */
notify = (notify_payload_t*)payload;
if (notify->get_notify_type(notify) == REKEY_SA &&
(notify->get_protocol_id(notify) == PROTO_AH ||
notify->get_protocol_id(notify) == PROTO_ESP))
{
notify_found = TRUE;
}
break;
}
case PLV2_TS_INITIATOR:
case PLV2_TS_RESPONDER:
{ /* if we don't find a TS, its IKE rekeying */
ts_found = TRUE;
break;
}
default:
break;
}
}
enumerator->destroy(enumerator);
if (ts_found)
{
if (notify_found)
{
task = (task_t*)child_rekey_create(this->ike_sa,
PROTO_NONE, 0);
}
else
{
task = (task_t*)child_create_create(this->ike_sa, NULL,
FALSE, NULL, NULL);
}
}
else
{
task = (task_t*)ike_rekey_create(this->ike_sa, FALSE);
}
array_insert(this->passive_tasks, ARRAY_TAIL, task);
break;
}
case INFORMATIONAL:
{
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
switch (payload->get_type(payload))
{
case PLV2_NOTIFY:
{
notify = (notify_payload_t*)payload;
if (state == IKE_REKEYED)
{
DBG1(DBG_IKE, "received unexpected notify %N "
"for rekeyed IKE_SA, ignored",
notify_type_names,
notify->get_notify_type(notify));
break;
}
switch (notify->get_notify_type(notify))
{
case ADDITIONAL_IP4_ADDRESS:
case ADDITIONAL_IP6_ADDRESS:
case NO_ADDITIONAL_ADDRESSES:
case UPDATE_SA_ADDRESSES:
case NO_NATS_ALLOWED:
case UNACCEPTABLE_ADDRESSES:
case UNEXPECTED_NAT_DETECTED:
case COOKIE2:
case NAT_DETECTION_SOURCE_IP:
case NAT_DETECTION_DESTINATION_IP:
task = (task_t*)ike_mobike_create(
this->ike_sa, FALSE);
break;
case AUTH_LIFETIME:
task = (task_t*)ike_auth_lifetime_create(
this->ike_sa, FALSE);
break;
case AUTHENTICATION_FAILED:
/* initiator failed to authenticate us.
* We use ike_delete to handle this, which
* invokes all the required hooks. */
task = (task_t*)ike_delete_create(
this->ike_sa, FALSE);
break;
case REDIRECT:
task = (task_t*)ike_redirect_create(
this->ike_sa, NULL);
break;
case IKEV2_MESSAGE_ID_SYNC:
task = (task_t*)ike_mid_sync_create(
this->ike_sa);
break;
default:
break;
}
break;
}
case PLV2_DELETE:
{
delete = (delete_payload_t*)payload;
if (delete->get_protocol_id(delete) == PROTO_IKE)
{
task = (task_t*)ike_delete_create(this->ike_sa,
FALSE);
}
else
{
task = (task_t*)child_delete_create(this->ike_sa,
PROTO_NONE, 0, FALSE);
}
break;
}
default:
break;
}
if (task)
{
break;
}
}
enumerator->destroy(enumerator);
if (task == NULL)
{
task = (task_t*)ike_dpd_create(FALSE);
}
array_insert(this->passive_tasks, ARRAY_TAIL, task);
break;
}
#ifdef ME
case ME_CONNECT:
{
task = (task_t*)ike_me_create(this->ike_sa, FALSE);
array_insert(this->passive_tasks, ARRAY_TAIL, task);
}
#endif /* ME */
default:
break;
}
}
enumerator = array_create_enumerator(this->passive_tasks);
while (enumerator->enumerate(enumerator, &task))
{
if (!task->pre_process)
{
continue;
}
switch (task->pre_process(task, message))
{
case SUCCESS:
break;
case FAILED:
default:
/* just ignore the message */
DBG1(DBG_IKE, "ignore invalid %N request",
exchange_type_names, message->get_exchange_type(message));
enumerator->destroy(enumerator);
switch (message->get_exchange_type(message))
{
case IKE_SA_INIT:
/* no point in keeping the SA when it was created with
* an invalid IKE_SA_INIT message */
return DESTROY_ME;
default:
/* remove tasks we queued for this request */
flush_queue(this, TASK_QUEUE_PASSIVE);
/* fall-through */
case IKE_AUTH:
return NEED_MORE;
}
case DESTROY_ME:
/* critical failure, destroy IKE_SA */
enumerator->destroy(enumerator);
return DESTROY_ME;
}
}
enumerator->destroy(enumerator);
/* let the tasks process the message */
enumerator = array_create_enumerator(this->passive_tasks);
while (enumerator->enumerate(enumerator, (void*)&task))
{
switch (task->process(task, message))
{
case SUCCESS:
/* task completed, remove it */
array_remove_at(this->passive_tasks, enumerator);
task->destroy(task);
break;
case NEED_MORE:
/* processed, but task needs at least another call to build() */
break;
case FAILED:
default:
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
/* FALL */
case DESTROY_ME:
/* critical failure, destroy IKE_SA */
array_remove_at(this->passive_tasks, enumerator);
enumerator->destroy(enumerator);
task->destroy(task);
return DESTROY_ME;
}
}
enumerator->destroy(enumerator);
return build_response(this, message);
}
METHOD(task_manager_t, incr_mid, void,
private_task_manager_t *this, bool initiate)
{
if (initiate)
{
this->initiating.mid++;
}
else
{
this->responding.mid++;
}
}
METHOD(task_manager_t, get_mid, uint32_t,
private_task_manager_t *this, bool initiate)
{
return initiate ? this->initiating.mid : this->responding.mid;
}
/**
* Handle the given IKE fragment, if it is one.
*
* Returns SUCCESS if the message is not a fragment, and NEED_MORE if it was
* handled properly. Error states are returned if the fragment was invalid or
* the reassembled message could not have been processed properly.
*/
static status_t handle_fragment(private_task_manager_t *this,
message_t **defrag, message_t *msg)
{
message_t *reassembled;
status_t status;
if (!msg->get_payload(msg, PLV2_FRAGMENT))
{
return SUCCESS;
}
if (!*defrag)
{
*defrag = message_create_defrag(msg);
if (!*defrag)
{
return FAILED;
}
}
status = (*defrag)->add_fragment(*defrag, msg);
if (status == SUCCESS)
{
/* reinject the reassembled message */
reassembled = *defrag;
*defrag = NULL;
status = this->ike_sa->process_message(this->ike_sa, reassembled);
if (status == SUCCESS)
{
/* avoid processing the last fragment */
status = NEED_MORE;
}
reassembled->destroy(reassembled);
}
return status;
}
/**
* Send a notify back to the sender
*/
static void send_notify_response(private_task_manager_t *this,
message_t *request, notify_type_t type,
chunk_t data)
{
message_t *response;
packet_t *packet;
host_t *me, *other;
response = message_create(IKEV2_MAJOR_VERSION, IKEV2_MINOR_VERSION);
response->set_exchange_type(response, request->get_exchange_type(request));
response->set_request(response, FALSE);
response->set_message_id(response, request->get_message_id(request));
response->add_notify(response, FALSE, type, data);
me = this->ike_sa->get_my_host(this->ike_sa);
if (me->is_anyaddr(me))
{
me = request->get_destination(request);
this->ike_sa->set_my_host(this->ike_sa, me->clone(me));
}
other = this->ike_sa->get_other_host(this->ike_sa);
if (other->is_anyaddr(other))
{
other = request->get_source(request);
this->ike_sa->set_other_host(this->ike_sa, other->clone(other));
}
response->set_source(response, me->clone(me));
response->set_destination(response, other->clone(other));
if (this->ike_sa->generate_message(this->ike_sa, response,
&packet) == SUCCESS)
{
charon->sender->send(charon->sender, packet);
}
response->destroy(response);
}
/**
* Send an INVALID_SYNTAX notify and destroy the IKE_SA for authenticated
* messages.
*/
static status_t send_invalid_syntax(private_task_manager_t *this,
message_t *msg)
{
send_notify_response(this, msg, INVALID_SYNTAX, chunk_empty);
incr_mid(this, FALSE);
/* IKE_SA_INIT is currently the only type the parser accepts unprotected,
* don't destroy the IKE_SA if such a message is invalid */
if (msg->get_exchange_type(msg) == IKE_SA_INIT)
{
return FAILED;
}
return DESTROY_ME;
}
/**
* Parse the given message and verify that it is valid.
*/
static status_t parse_message(private_task_manager_t *this, message_t *msg)
{
status_t parse_status, status;
uint8_t type = 0;
parse_status = msg->parse_body(msg, this->ike_sa->get_keymat(this->ike_sa));
if (parse_status == SUCCESS)
{ /* check for unsupported critical payloads */
enumerator_t *enumerator;
unknown_payload_t *unknown;
payload_t *payload;
enumerator = msg->create_payload_enumerator(msg);
while (enumerator->enumerate(enumerator, &payload))
{
if (payload->get_type(payload) == PL_UNKNOWN)
{
unknown = (unknown_payload_t*)payload;
if (unknown->is_critical(unknown))
{
type = unknown->get_type(unknown);
DBG1(DBG_ENC, "payload type %N is not supported, "
"but payload is critical!", payload_type_names, type);
parse_status = NOT_SUPPORTED;
break;
}
}
}
enumerator->destroy(enumerator);
}
status = parse_status;
if (parse_status != SUCCESS)
{
bool is_request = msg->get_request(msg);
switch (parse_status)
{
case NOT_SUPPORTED:
DBG1(DBG_IKE, "critical unknown payloads found");
if (is_request)
{
send_notify_response(this, msg,
UNSUPPORTED_CRITICAL_PAYLOAD,
chunk_from_thing(type));
incr_mid(this, FALSE);
}
break;
case PARSE_ERROR:
DBG1(DBG_IKE, "message parsing failed");
if (is_request)
{
status = send_invalid_syntax(this, msg);
}
break;
case VERIFY_ERROR:
DBG1(DBG_IKE, "message verification failed");
if (is_request)
{
status = send_invalid_syntax(this, msg);
}
break;
case FAILED:
DBG1(DBG_IKE, "integrity check failed");
/* ignored */
break;
case INVALID_STATE:
DBG1(DBG_IKE, "found encrypted message, but no keys available");
default:
break;
}
DBG1(DBG_IKE, "%N %s with message ID %d processing failed",
exchange_type_names, msg->get_exchange_type(msg),
is_request ? "request" : "response",
msg->get_message_id(msg));
charon->bus->alert(charon->bus, ALERT_PARSE_ERROR_BODY, msg,
parse_status);
switch (this->ike_sa->get_state(this->ike_sa))
{
case IKE_CREATED:
/* invalid initiation attempt, close SA */
status = DESTROY_ME;
break;
case IKE_CONNECTING:
case IKE_REKEYED:
/* don't trigger updown event in these states */
break;
default:
if (status == DESTROY_ME)
{
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
}
break;
}
}
return status;
}
/**
* Check if a message with message ID 0 looks like it is used to synchronize
* the message IDs.
*/
static bool looks_like_mid_sync(private_task_manager_t *this, message_t *msg,
bool strict)
{
enumerator_t *enumerator;
notify_payload_t *notify;
payload_t *payload;
bool found = FALSE, other = FALSE;
if (msg->get_exchange_type(msg) == INFORMATIONAL)
{
enumerator = msg->create_payload_enumerator(msg);
while (enumerator->enumerate(enumerator, &payload))
{
if (payload->get_type(payload) == PLV2_NOTIFY)
{
notify = (notify_payload_t*)payload;
switch (notify->get_notify_type(notify))
{
case IKEV2_MESSAGE_ID_SYNC:
case IPSEC_REPLAY_COUNTER_SYNC:
found = TRUE;
continue;
default:
break;
}
}
if (strict)
{
other = TRUE;
break;
}
}
enumerator->destroy(enumerator);
}
return found && !other;
}
/**
* Check whether we should reject the given request message
*/
static inline bool reject_request(private_task_manager_t *this,
message_t *msg)
{
ike_sa_state_t state;
exchange_type_t type;
ike_sa_id_t *ike_sa_id;
bool reject = FALSE;
state = this->ike_sa->get_state(this->ike_sa);
type = msg->get_exchange_type(msg);
/* reject initial messages if not received in specific states */
switch (type)
{
case IKE_SA_INIT:
reject = state != IKE_CREATED;
break;
case IKE_AUTH:
reject = state != IKE_CONNECTING;
break;
default:
break;
}
if (!reject)
{
switch (state)
{
/* after rekeying we only expect a DELETE in an INFORMATIONAL */
case IKE_REKEYED:
reject = type != INFORMATIONAL;
break;
/* also reject requests for half-open IKE_SAs as initiator */
case IKE_CREATED:
case IKE_CONNECTING:
ike_sa_id = this->ike_sa->get_id(this->ike_sa);
reject = ike_sa_id->is_initiator(ike_sa_id);
break;
default:
break;
}
}
if (reject)
{
DBG1(DBG_IKE, "ignoring %N in IKE_SA state %N", exchange_type_names,
type, ike_sa_state_names, state);
}
return reject;
}
/**
* Check if a message with message ID 0 looks like it is used to synchronize
* the message IDs and we are prepared to process it.
*
* Note: This is not called if the responder never sent a message before (i.e.
* we expect MID 0).
*/
static bool is_mid_sync(private_task_manager_t *this, message_t *msg)
{
if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED &&
this->ike_sa->supports_extension(this->ike_sa,
EXT_IKE_MESSAGE_ID_SYNC))
{
return looks_like_mid_sync(this, msg, TRUE);
}
return FALSE;
}
METHOD(task_manager_t, process_message, status_t,
private_task_manager_t *this, message_t *msg)
{
host_t *me, *other;
status_t status;
uint32_t mid;
bool schedule_delete_job = FALSE;
charon->bus->message(charon->bus, msg, TRUE, FALSE);
status = parse_message(this, msg);
if (status != SUCCESS)
{
return status;
}
me = msg->get_destination(msg);
other = msg->get_source(msg);
/* if this IKE_SA is virgin, we check for a config */
if (this->ike_sa->get_ike_cfg(this->ike_sa) == NULL)
{
ike_cfg_t *ike_cfg;
ike_cfg = charon->backends->get_ike_cfg(charon->backends,
me, other, IKEV2);
if (ike_cfg == NULL)
{
/* no config found for these hosts, destroy */
DBG1(DBG_IKE, "no IKE config found for %H...%H, sending %N",
me, other, notify_type_names, NO_PROPOSAL_CHOSEN);
send_notify_response(this, msg,
NO_PROPOSAL_CHOSEN, chunk_empty);
return DESTROY_ME;
}
this->ike_sa->set_ike_cfg(this->ike_sa, ike_cfg);
ike_cfg->destroy(ike_cfg);
/* add a timeout if peer does not establish it completely */
schedule_delete_job = TRUE;
}
mid = msg->get_message_id(msg);
if (msg->get_request(msg))
{
if (mid == this->responding.mid || (mid == 0 && is_mid_sync(this, msg)))
{
if (reject_request(this, msg))
{
return FAILED;
}
if (!this->ike_sa->supports_extension(this->ike_sa, EXT_MOBIKE))
{ /* with MOBIKE, we do no implicit updates */
this->ike_sa->update_hosts(this->ike_sa, me, other, mid == 1);
}
status = handle_fragment(this, &this->responding.defrag, msg);
if (status != SUCCESS)
{
if (status == NEED_MORE)
{
this->ike_sa->set_statistic(this->ike_sa, STAT_INBOUND,
time_monotonic(NULL));
}
return status;
}
charon->bus->message(charon->bus, msg, TRUE, TRUE);
if (msg->get_exchange_type(msg) == EXCHANGE_TYPE_UNDEFINED)
{ /* ignore messages altered to EXCHANGE_TYPE_UNDEFINED */
return SUCCESS;
}
switch (process_request(this, msg))
{
case SUCCESS:
this->ike_sa->set_statistic(this->ike_sa, STAT_INBOUND,
time_monotonic(NULL));
this->responding.mid++;
break;
case NEED_MORE:
break;
default:
flush(this);
return DESTROY_ME;
}
}
else if ((mid == this->responding.mid - 1) &&
array_count(this->responding.packets) &&
!(mid == 0 && looks_like_mid_sync(this, msg, FALSE)))
{
status = handle_fragment(this, &this->responding.defrag, msg);
if (status != SUCCESS)
{
if (status == NEED_MORE)
{
this->ike_sa->set_statistic(this->ike_sa, STAT_INBOUND,
time_monotonic(NULL));
}
return status;
}
DBG1(DBG_IKE, "received retransmit of request with ID %d, "
"retransmitting response", mid);
this->ike_sa->set_statistic(this->ike_sa, STAT_INBOUND,
time_monotonic(NULL));
charon->bus->alert(charon->bus, ALERT_RETRANSMIT_RECEIVE, msg);
send_packets(this, this->responding.packets,
msg->get_destination(msg), msg->get_source(msg));
}
else
{
DBG1(DBG_IKE, "received message ID %d, expected %d, ignored",
mid, this->responding.mid);
}
}
else
{
if (mid == this->initiating.mid)
{
if (this->ike_sa->get_state(this->ike_sa) == IKE_CREATED ||
this->ike_sa->get_state(this->ike_sa) == IKE_CONNECTING ||
msg->get_exchange_type(msg) != IKE_SA_INIT)
{ /* only do updates based on verified messages (or initial ones) */
if (!this->ike_sa->supports_extension(this->ike_sa, EXT_MOBIKE))
{ /* with MOBIKE, we do no implicit updates. we force an
* update of the local address on IKE_SA_INIT, but never
* for the remote address */
this->ike_sa->update_hosts(this->ike_sa, me, NULL, mid == 0);
this->ike_sa->update_hosts(this->ike_sa, NULL, other, FALSE);
}
}
status = handle_fragment(this, &this->initiating.defrag, msg);
if (status != SUCCESS)
{
if (status == NEED_MORE)
{
this->ike_sa->set_statistic(this->ike_sa, STAT_INBOUND,
time_monotonic(NULL));
}
return status;
}
charon->bus->message(charon->bus, msg, TRUE, TRUE);
if (msg->get_exchange_type(msg) == EXCHANGE_TYPE_UNDEFINED)
{ /* ignore messages altered to EXCHANGE_TYPE_UNDEFINED */
return SUCCESS;
}
if (process_response(this, msg) != SUCCESS)
{
flush(this);
return DESTROY_ME;
}
this->ike_sa->set_statistic(this->ike_sa, STAT_INBOUND,
time_monotonic(NULL));
}
else
{
DBG1(DBG_IKE, "received message ID %d, expected %d, ignored",
mid, this->initiating.mid);
return SUCCESS;
}
}
if (schedule_delete_job)
{
ike_sa_id_t *ike_sa_id;
job_t *job;
ike_sa_id = this->ike_sa->get_id(this->ike_sa);
job = (job_t*)delete_ike_sa_job_create(ike_sa_id, FALSE);
lib->scheduler->schedule_job(lib->scheduler, job,
lib->settings->get_int(lib->settings,
"%s.half_open_timeout", HALF_OPEN_IKE_SA_TIMEOUT,
lib->ns));
}
return SUCCESS;
}
METHOD(task_manager_t, queue_task_delayed, void,
private_task_manager_t *this, task_t *task, uint32_t delay)
{
queued_task_t *queued;
timeval_t time;
time_monotonic(&time);
if (delay)
{
job_t *job;
DBG2(DBG_IKE, "queueing %N task (delayed by %us)", task_type_names,
task->get_type(task), delay);
time.tv_sec += delay;
job = (job_t*)initiate_tasks_job_create(
this->ike_sa->get_id(this->ike_sa));
lib->scheduler->schedule_job_tv(lib->scheduler, job, time);
}
else
{
DBG2(DBG_IKE, "queueing %N task", task_type_names,
task->get_type(task));
}
INIT(queued,
.task = task,
.time = time,
);
array_insert(this->queued_tasks, ARRAY_TAIL, queued);
}
METHOD(task_manager_t, queue_task, void,
private_task_manager_t *this, task_t *task)
{
queue_task_delayed(this, task, 0);
}
/**
* Check if a given task has been queued already
*/
static bool has_queued(private_task_manager_t *this, task_type_t type)
{
enumerator_t *enumerator;
bool found = FALSE;
queued_task_t *queued;
enumerator = array_create_enumerator(this->queued_tasks);
while (enumerator->enumerate(enumerator, &queued))
{
if (queued->task->get_type(queued->task) == type)
{
found = TRUE;
break;
}
}
enumerator->destroy(enumerator);
return found;
}
METHOD(task_manager_t, queue_ike, void,
private_task_manager_t *this)
{
if (!has_queued(this, TASK_IKE_VENDOR))
{
queue_task(this, (task_t*)ike_vendor_create(this->ike_sa, TRUE));
}
if (!has_queued(this, TASK_IKE_INIT))
{
queue_task(this, (task_t*)ike_init_create(this->ike_sa, TRUE, NULL));
}
if (!has_queued(this, TASK_IKE_NATD))
{
queue_task(this, (task_t*)ike_natd_create(this->ike_sa, TRUE));
}
if (!has_queued(this, TASK_IKE_CERT_PRE))
{
queue_task(this, (task_t*)ike_cert_pre_create(this->ike_sa, TRUE));
}
if (!has_queued(this, TASK_IKE_AUTH))
{
queue_task(this, (task_t*)ike_auth_create(this->ike_sa, TRUE));
}
if (!has_queued(this, TASK_IKE_CERT_POST))
{
queue_task(this, (task_t*)ike_cert_post_create(this->ike_sa, TRUE));
}
if (!has_queued(this, TASK_IKE_CONFIG))
{
queue_task(this, (task_t*)ike_config_create(this->ike_sa, TRUE));
}
if (!has_queued(this, TASK_IKE_AUTH_LIFETIME))
{
queue_task(this, (task_t*)ike_auth_lifetime_create(this->ike_sa, TRUE));
}
if (!has_queued(this, TASK_IKE_MOBIKE))
{
peer_cfg_t *peer_cfg;
peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
if (peer_cfg->use_mobike(peer_cfg))
{
queue_task(this, (task_t*)ike_mobike_create(this->ike_sa, TRUE));
}
}
#ifdef ME
if (!has_queued(this, TASK_IKE_ME))
{
queue_task(this, (task_t*)ike_me_create(this->ike_sa, TRUE));
}
#endif /* ME */
}
METHOD(task_manager_t, queue_ike_rekey, void,
private_task_manager_t *this)
{
queue_task(this, (task_t*)ike_rekey_create(this->ike_sa, TRUE));
}
/**
* Start reauthentication using make-before-break
*/
static void trigger_mbb_reauth(private_task_manager_t *this)
{
enumerator_t *enumerator;
child_sa_t *child_sa;
child_cfg_t *cfg;
peer_cfg_t *peer;
ike_sa_t *new;
host_t *host;
queued_task_t *queued;
bool children = FALSE;
new = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager,
this->ike_sa->get_version(this->ike_sa), TRUE);
if (!new)
{ /* shouldn't happen */
return;
}
peer = this->ike_sa->get_peer_cfg(this->ike_sa);
new->set_peer_cfg(new, peer);
host = this->ike_sa->get_other_host(this->ike_sa);
new->set_other_host(new, host->clone(host));
host = this->ike_sa->get_my_host(this->ike_sa);
new->set_my_host(new, host->clone(host));
enumerator = this->ike_sa->create_virtual_ip_enumerator(this->ike_sa, TRUE);
while (enumerator->enumerate(enumerator, &host))
{
new->add_virtual_ip(new, TRUE, host);
}
enumerator->destroy(enumerator);
enumerator = this->ike_sa->create_child_sa_enumerator(this->ike_sa);
while (enumerator->enumerate(enumerator, &child_sa))
{
child_create_t *child_create;
switch (child_sa->get_state(child_sa))
{
case CHILD_REKEYED:
case CHILD_DELETED:
/* ignore CHILD_SAs in these states */
continue;
default:
break;
}
cfg = child_sa->get_config(child_sa);
child_create = child_create_create(new, cfg->get_ref(cfg),
FALSE, NULL, NULL);
child_create->use_reqid(child_create, child_sa->get_reqid(child_sa));
child_create->use_marks(child_create,
child_sa->get_mark(child_sa, TRUE).value,
child_sa->get_mark(child_sa, FALSE).value);
/* interface IDs are not migrated as the new CHILD_SAs on old and new
* IKE_SA go though regular updown events */
new->queue_task(new, &child_create->task);
children = TRUE;
}
enumerator->destroy(enumerator);
enumerator = array_create_enumerator(this->queued_tasks);
while (enumerator->enumerate(enumerator, &queued))
{
if (queued->task->get_type(queued->task) == TASK_CHILD_CREATE)
{
queued->task->migrate(queued->task, new);
new->queue_task(new, queued->task);
array_remove_at(this->queued_tasks, enumerator);
free(queued);
children = TRUE;
}
}
enumerator->destroy(enumerator);
if (!children
#ifdef ME
/* allow reauth of mediation connections without CHILD_SAs */
&& !peer->is_mediation(peer)
#endif /* ME */
)
{
charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager, new);
DBG1(DBG_IKE, "unable to reauthenticate IKE_SA, no CHILD_SA "
"to recreate");
return;
}
/* suspend online revocation checking until the SA is established */
new->set_condition(new, COND_ONLINE_VALIDATION_SUSPENDED, TRUE);
if (new->initiate(new, NULL, 0, NULL, NULL) != DESTROY_ME)
{
new->queue_task(new, (task_t*)ike_verify_peer_cert_create(new));
new->queue_task(new, (task_t*)ike_reauth_complete_create(new,
this->ike_sa->get_id(this->ike_sa)));
charon->ike_sa_manager->checkin(charon->ike_sa_manager, new);
}
else
{
charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager, new);
DBG1(DBG_IKE, "reauthenticating IKE_SA failed");
}
charon->bus->set_sa(charon->bus, this->ike_sa);
}
METHOD(task_manager_t, queue_ike_reauth, void,
private_task_manager_t *this)
{
if (this->make_before_break)
{
return trigger_mbb_reauth(this);
}
queue_task(this, (task_t*)ike_reauth_create(this->ike_sa));
}
METHOD(task_manager_t, queue_ike_delete, void,
private_task_manager_t *this)
{
queue_task(this, (task_t*)ike_delete_create(this->ike_sa, TRUE));
}
/**
* There is no need to queue more than one mobike task, so this either returns
* an already queued task or queues one if there is none yet.
*/
static ike_mobike_t *queue_mobike_task(private_task_manager_t *this)
{
enumerator_t *enumerator;
queued_task_t *queued;
ike_mobike_t *mobike = NULL;
enumerator = array_create_enumerator(this->queued_tasks);
while (enumerator->enumerate(enumerator, &queued))
{
if (queued->task->get_type(queued->task) == TASK_IKE_MOBIKE)
{
mobike = (ike_mobike_t*)queued->task;
break;
}
}
enumerator->destroy(enumerator);
if (!mobike)
{
mobike = ike_mobike_create(this->ike_sa, TRUE);
queue_task(this, &mobike->task);
}
return mobike;
}
METHOD(task_manager_t, queue_mobike, void,
private_task_manager_t *this, bool roam, bool address)
{
ike_mobike_t *mobike;
mobike = queue_mobike_task(this);
if (roam)
{
enumerator_t *enumerator;
task_t *current;
mobike->roam(mobike, address);
/* enable path probing for a currently active MOBIKE task. This might
* not be the case if an address appeared on a new interface while the
* current address is not working but has not yet disappeared. */
enumerator = array_create_enumerator(this->active_tasks);
while (enumerator->enumerate(enumerator, &current))
{
if (current->get_type(current) == TASK_IKE_MOBIKE)
{
ike_mobike_t *active = (ike_mobike_t*)current;
active->enable_probing(active);
break;
}
}
enumerator->destroy(enumerator);
}
else
{
mobike->addresses(mobike);
}
}
METHOD(task_manager_t, queue_dpd, void,
private_task_manager_t *this)
{
ike_mobike_t *mobike;
if (this->ike_sa->supports_extension(this->ike_sa, EXT_MOBIKE))
{
#ifdef ME
peer_cfg_t *cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
if (cfg->get_peer_id(cfg) ||
this->ike_sa->has_condition(this->ike_sa, COND_ORIGINAL_INITIATOR))
#else
if (this->ike_sa->has_condition(this->ike_sa, COND_ORIGINAL_INITIATOR))
#endif
{
/* use mobike enabled DPD to detect NAT mapping changes */
mobike = queue_mobike_task(this);
mobike->dpd(mobike);
return;
}
}
queue_task(this, (task_t*)ike_dpd_create(TRUE));
}
METHOD(task_manager_t, queue_child, void,
private_task_manager_t *this, child_cfg_t *cfg, uint32_t reqid,
traffic_selector_t *tsi, traffic_selector_t *tsr)
{
child_create_t *task;
task = child_create_create(this->ike_sa, cfg, FALSE, tsi, tsr);
if (reqid)
{
task->use_reqid(task, reqid);
}
queue_task(this, &task->task);
}
METHOD(task_manager_t, queue_child_rekey, void,
private_task_manager_t *this, protocol_id_t protocol, uint32_t spi)
{
queue_task(this, (task_t*)child_rekey_create(this->ike_sa, protocol, spi));
}
METHOD(task_manager_t, queue_child_delete, void,
private_task_manager_t *this, protocol_id_t protocol, uint32_t spi,
bool expired)
{
queue_task(this, (task_t*)child_delete_create(this->ike_sa,
protocol, spi, expired));
}
METHOD(task_manager_t, adopt_tasks, void,
private_task_manager_t *this, task_manager_t *other_public)
{
private_task_manager_t *other = (private_task_manager_t*)other_public;
queued_task_t *queued;
timeval_t now;
time_monotonic(&now);
/* move queued tasks from other to this */
while (array_remove(other->queued_tasks, ARRAY_TAIL, &queued))
{
DBG2(DBG_IKE, "migrating %N task", task_type_names,
queued->task->get_type(queued->task));
queued->task->migrate(queued->task, this->ike_sa);
/* don't delay tasks on the new IKE_SA */
queued->time = now;
array_insert(this->queued_tasks, ARRAY_HEAD, queued);
}
}
METHOD(task_manager_t, busy, bool,
private_task_manager_t *this)
{
return array_count(this->active_tasks) > 0;
}
METHOD(task_manager_t, reset, void,
private_task_manager_t *this, uint32_t initiate, uint32_t respond)
{
enumerator_t *enumerator;
queued_task_t *queued;
task_t *task;
timeval_t now;
/* reset message counters and retransmit packets */
clear_packets(this->responding.packets);
clear_packets(this->initiating.packets);
DESTROY_IF(this->responding.defrag);
DESTROY_IF(this->initiating.defrag);
this->responding.defrag = NULL;
this->initiating.defrag = NULL;
if (initiate != UINT_MAX)
{
this->initiating.mid = initiate;
}
if (respond != UINT_MAX)
{
this->responding.mid = respond;
}
this->initiating.type = EXCHANGE_TYPE_UNDEFINED;
time_monotonic(&now);
/* reset queued tasks */
enumerator = array_create_enumerator(this->queued_tasks);
while (enumerator->enumerate(enumerator, &queued))
{
queued->time = now;
queued->task->migrate(queued->task, this->ike_sa);
}
enumerator->destroy(enumerator);
/* reset active tasks */
while (array_remove(this->active_tasks, ARRAY_TAIL, &task))
{
task->migrate(task, this->ike_sa);
INIT(queued,
.task = task,
.time = now,
);
array_insert(this->queued_tasks, ARRAY_HEAD, queued);
}
this->reset = TRUE;
}
/**
* Data for a task queue enumerator
*/
typedef struct {
enumerator_t public;
task_queue_t queue;
enumerator_t *inner;
queued_task_t *queued;
} task_enumerator_t;
METHOD(enumerator_t, task_enumerator_destroy, void,
task_enumerator_t *this)
{
this->inner->destroy(this->inner);
free(this);
}
METHOD(enumerator_t, task_enumerator_enumerate, bool,
task_enumerator_t *this, va_list args)
{
task_t **task;
VA_ARGS_VGET(args, task);
if (this->queue == TASK_QUEUE_QUEUED)
{
if (this->inner->enumerate(this->inner, &this->queued))
{
*task = this->queued->task;
return TRUE;
}
}
else if (this->inner->enumerate(this->inner, task))
{
return TRUE;
}
return FALSE;
}
METHOD(task_manager_t, create_task_enumerator, enumerator_t*,
private_task_manager_t *this, task_queue_t queue)
{
task_enumerator_t *enumerator;
INIT(enumerator,
.public = {
.enumerate = enumerator_enumerate_default,
.venumerate = _task_enumerator_enumerate,
.destroy = _task_enumerator_destroy,
},
.queue = queue,
);
switch (queue)
{
case TASK_QUEUE_ACTIVE:
enumerator->inner = array_create_enumerator(this->active_tasks);
break;
case TASK_QUEUE_PASSIVE:
enumerator->inner = array_create_enumerator(this->passive_tasks);
break;
case TASK_QUEUE_QUEUED:
enumerator->inner = array_create_enumerator(this->queued_tasks);
break;
default:
enumerator->inner = enumerator_create_empty();
break;
}
return &enumerator->public;
}
METHOD(task_manager_t, remove_task, void,
private_task_manager_t *this, enumerator_t *enumerator_public)
{
task_enumerator_t *enumerator = (task_enumerator_t*)enumerator_public;
switch (enumerator->queue)
{
case TASK_QUEUE_ACTIVE:
array_remove_at(this->active_tasks, enumerator->inner);
break;
case TASK_QUEUE_PASSIVE:
array_remove_at(this->passive_tasks, enumerator->inner);
break;
case TASK_QUEUE_QUEUED:
array_remove_at(this->queued_tasks, enumerator->inner);
free(enumerator->queued);
enumerator->queued = NULL;
break;
default:
break;
}
}
METHOD(task_manager_t, destroy, void,
private_task_manager_t *this)
{
flush(this);
array_destroy(this->active_tasks);
array_destroy(this->queued_tasks);
array_destroy(this->passive_tasks);
clear_packets(this->responding.packets);
array_destroy(this->responding.packets);
clear_packets(this->initiating.packets);
array_destroy(this->initiating.packets);
DESTROY_IF(this->responding.defrag);
DESTROY_IF(this->initiating.defrag);
free(this);
}
/*
* see header file
*/
task_manager_v2_t *task_manager_v2_create(ike_sa_t *ike_sa)
{
private_task_manager_t *this;
INIT(this,
.public = {
.task_manager = {
.process_message = _process_message,
.queue_task = _queue_task,
.queue_task_delayed = _queue_task_delayed,
.queue_ike = _queue_ike,
.queue_ike_rekey = _queue_ike_rekey,
.queue_ike_reauth = _queue_ike_reauth,
.queue_ike_delete = _queue_ike_delete,
.queue_mobike = _queue_mobike,
.queue_child = _queue_child,
.queue_child_rekey = _queue_child_rekey,
.queue_child_delete = _queue_child_delete,
.queue_dpd = _queue_dpd,
.initiate = _initiate,
.retransmit = _retransmit,
.incr_mid = _incr_mid,
.get_mid = _get_mid,
.reset = _reset,
.adopt_tasks = _adopt_tasks,
.busy = _busy,
.create_task_enumerator = _create_task_enumerator,
.remove_task = _remove_task,
.flush = _flush,
.flush_queue = _flush_queue,
.destroy = _destroy,
},
},
.ike_sa = ike_sa,
.initiating.type = EXCHANGE_TYPE_UNDEFINED,
.queued_tasks = array_create(0, 0),
.active_tasks = array_create(0, 0),
.passive_tasks = array_create(0, 0),
.retransmit_tries = lib->settings->get_int(lib->settings,
"%s.retransmit_tries", RETRANSMIT_TRIES, lib->ns),
.retransmit_timeout = lib->settings->get_double(lib->settings,
"%s.retransmit_timeout", RETRANSMIT_TIMEOUT, lib->ns),
.retransmit_base = lib->settings->get_double(lib->settings,
"%s.retransmit_base", RETRANSMIT_BASE, lib->ns),
.retransmit_jitter = min(lib->settings->get_int(lib->settings,
"%s.retransmit_jitter", 0, lib->ns), RETRANSMIT_JITTER_MAX),
.retransmit_limit = lib->settings->get_int(lib->settings,
"%s.retransmit_limit", 0, lib->ns) * 1000,
.make_before_break = lib->settings->get_bool(lib->settings,
"%s.make_before_break", FALSE, lib->ns),
);
if (this->retransmit_base > 1)
{ /* based on 1000 * timeout * base^try */
this->retransmit_tries_max = log(UINT32_MAX/
(1000.0 * this->retransmit_timeout))/
log(this->retransmit_base);
}
return &this->public;
}
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