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strongswan/src/libcharon/sa/ikev1/tasks/aggressive_mode.c

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/*
* Copyright (C) 2012 Tobias Brunner
* HSR Hochschule fuer Technik Rapperswil
*
* Copyright (C) 2012 Martin Willi
* Copyright (C) 2012 revosec AG
*
* 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 "aggressive_mode.h"
#include <string.h>
#include <daemon.h>
#include <sa/ikev1/phase1.h>
#include <encoding/payloads/sa_payload.h>
#include <encoding/payloads/id_payload.h>
#include <encoding/payloads/hash_payload.h>
#include <sa/ikev1/tasks/xauth.h>
#include <sa/ikev1/tasks/mode_config.h>
#include <sa/ikev1/tasks/informational.h>
#include <sa/ikev1/tasks/isakmp_delete.h>
#include <processing/jobs/adopt_children_job.h>
#include <processing/jobs/delete_ike_sa_job.h>
typedef struct private_aggressive_mode_t private_aggressive_mode_t;
/**
* Private members of a aggressive_mode_t task.
*/
struct private_aggressive_mode_t {
/**
* Public methods and task_t interface.
*/
aggressive_mode_t public;
/**
* Assigned IKE_SA.
*/
ike_sa_t *ike_sa;
/**
* Are we the initiator?
*/
bool initiator;
/**
* Common phase 1 helper class
*/
phase1_t *ph1;
/**
* IKE config to establish
*/
ike_cfg_t *ike_cfg;
/**
* Peer config to use
*/
peer_cfg_t *peer_cfg;
/**
* selected IKE proposal
*/
proposal_t *proposal;
/**
* Negotiated SA lifetime
*/
uint32_t lifetime;
/**
* Negotiated authentication method
*/
auth_method_t method;
/**
* Encoded ID payload, without fixed header
*/
chunk_t id_data;
/** states of aggressive mode */
enum {
AM_INIT,
AM_AUTH,
} state;
};
/**
* Set IKE_SA to established state
*/
static bool establish(private_aggressive_mode_t *this)
{
if (!charon->bus->authorize(charon->bus, TRUE))
{
DBG1(DBG_IKE, "final authorization hook forbids IKE_SA, canceling");
return FALSE;
}
DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
this->ike_sa->get_name(this->ike_sa),
this->ike_sa->get_unique_id(this->ike_sa),
this->ike_sa->get_my_host(this->ike_sa),
this->ike_sa->get_my_id(this->ike_sa),
this->ike_sa->get_other_host(this->ike_sa),
this->ike_sa->get_other_id(this->ike_sa));
this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
charon->bus->ike_updown(charon->bus, this->ike_sa, TRUE);
return TRUE;
}
/**
* Check for notify errors, return TRUE if error found
*/
static bool has_notify_errors(private_aggressive_mode_t *this, message_t *message)
{
enumerator_t *enumerator;
payload_t *payload;
bool err = FALSE;
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
if (payload->get_type(payload) == PLV1_NOTIFY)
{
notify_payload_t *notify;
notify_type_t type;
notify = (notify_payload_t*)payload;
type = notify->get_notify_type(notify);
if (type < 16384)
{
DBG1(DBG_IKE, "received %N error notify",
notify_type_names, type);
err = TRUE;
}
else
{
DBG1(DBG_IKE, "received %N notify", notify_type_names, type);
}
}
}
enumerator->destroy(enumerator);
return err;
}
/**
* Queue a task sending a notify in an INFORMATIONAL exchange
*/
static status_t send_notify(private_aggressive_mode_t *this, notify_type_t type)
{
notify_payload_t *notify;
ike_sa_id_t *ike_sa_id;
uint64_t spi_i, spi_r;
chunk_t spi;
notify = notify_payload_create_from_protocol_and_type(PLV1_NOTIFY,
PROTO_IKE, type);
ike_sa_id = this->ike_sa->get_id(this->ike_sa);
spi_i = ike_sa_id->get_initiator_spi(ike_sa_id);
spi_r = ike_sa_id->get_responder_spi(ike_sa_id);
spi = chunk_cata("cc", chunk_from_thing(spi_i), chunk_from_thing(spi_r));
notify->set_spi_data(notify, spi);
this->ike_sa->queue_task(this->ike_sa,
(task_t*)informational_create(this->ike_sa, notify));
/* cancel all active/passive tasks in favor of informational */
this->ike_sa->flush_queue(this->ike_sa,
this->initiator ? TASK_QUEUE_ACTIVE : TASK_QUEUE_PASSIVE);
return ALREADY_DONE;
}
/**
* Queue a delete task if authentication failed as initiator
*/
static status_t send_delete(private_aggressive_mode_t *this)
{
this->ike_sa->queue_task(this->ike_sa,
(task_t*)isakmp_delete_create(this->ike_sa, TRUE));
/* cancel all active tasks in favor of informational */
this->ike_sa->flush_queue(this->ike_sa,
this->initiator ? TASK_QUEUE_ACTIVE : TASK_QUEUE_PASSIVE);
return ALREADY_DONE;
}
/**
* Schedule a timeout for the IKE_SA should it not establish
*/
static void schedule_timeout(ike_sa_t *ike_sa)
{
job_t *job;
job = (job_t*)delete_ike_sa_job_create(ike_sa->get_id(ike_sa), FALSE);
lib->scheduler->schedule_job(lib->scheduler, job, HALF_OPEN_IKE_SA_TIMEOUT);
}
METHOD(task_t, build_i, status_t,
private_aggressive_mode_t *this, message_t *message)
{
switch (this->state)
{
case AM_INIT:
{
sa_payload_t *sa_payload;
id_payload_t *id_payload;
linked_list_t *proposals;
identification_t *id;
packet_t *packet;
uint16_t group;
DBG0(DBG_IKE, "initiating Aggressive Mode IKE_SA %s[%d] to %H",
this->ike_sa->get_name(this->ike_sa),
this->ike_sa->get_unique_id(this->ike_sa),
this->ike_sa->get_other_host(this->ike_sa));
this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
this->ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
this->peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
this->peer_cfg->get_ref(this->peer_cfg);
this->method = this->ph1->get_auth_method(this->ph1, this->peer_cfg);
if (this->method == AUTH_NONE)
{
DBG1(DBG_CFG, "configuration uses unsupported authentication");
return FAILED;
}
this->lifetime = this->peer_cfg->get_reauth_time(this->peer_cfg,
FALSE);
if (!this->lifetime)
{ /* fall back to rekey time of no rekey time configured */
this->lifetime = this->peer_cfg->get_rekey_time(this->peer_cfg,
FALSE);
}
this->lifetime += this->peer_cfg->get_over_time(this->peer_cfg);
proposals = this->ike_cfg->get_proposals(this->ike_cfg);
sa_payload = sa_payload_create_from_proposals_v1(proposals,
this->lifetime, 0, this->method, MODE_NONE,
ENCAP_NONE, 0);
proposals->destroy_offset(proposals, offsetof(proposal_t, destroy));
message->add_payload(message, &sa_payload->payload_interface);
group = this->ike_cfg->get_dh_group(this->ike_cfg);
if (group == MODP_NONE)
{
DBG1(DBG_IKE, "DH group selection failed");
return FAILED;
}
if (!this->ph1->create_dh(this->ph1, group))
{
DBG1(DBG_IKE, "DH group %N not supported",
diffie_hellman_group_names, group);
return FAILED;
}
if (!this->ph1->add_nonce_ke(this->ph1, message))
{
return FAILED;
}
id = this->ph1->get_id(this->ph1, this->peer_cfg, TRUE);
this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
id_payload = id_payload_create_from_identification(PLV1_ID, id);
this->id_data = id_payload->get_encoded(id_payload);
message->add_payload(message, &id_payload->payload_interface);
/* pregenerate message to store SA payload */
if (this->ike_sa->generate_message(this->ike_sa, message,
&packet) != SUCCESS)
{
DBG1(DBG_IKE, "pregenerating SA payload failed");
return FAILED;
}
packet->destroy(packet);
if (!this->ph1->save_sa_payload(this->ph1, message))
{
DBG1(DBG_IKE, "SA payload invalid");
return FAILED;
}
this->state = AM_AUTH;
return NEED_MORE;
}
case AM_AUTH:
{
if (!this->ph1->build_auth(this->ph1, this->method, message,
this->id_data))
{
this->id_data = chunk_empty;
charon->bus->alert(charon->bus, ALERT_LOCAL_AUTH_FAILED);
return send_notify(this, AUTHENTICATION_FAILED);
}
this->id_data = chunk_empty;
switch (this->method)
{
case AUTH_XAUTH_INIT_PSK:
case AUTH_XAUTH_INIT_RSA:
case AUTH_HYBRID_INIT_RSA:
/* wait for XAUTH request */
schedule_timeout(this->ike_sa);
break;
case AUTH_XAUTH_RESP_PSK:
case AUTH_XAUTH_RESP_RSA:
case AUTH_HYBRID_RESP_RSA:
this->ike_sa->queue_task(this->ike_sa,
(task_t*)xauth_create(this->ike_sa, TRUE));
break;
default:
if (charon->ike_sa_manager->check_uniqueness(
charon->ike_sa_manager, this->ike_sa, FALSE))
{
DBG1(DBG_IKE, "canceling Aggressive Mode due to "
"uniqueness policy");
return send_notify(this, AUTHENTICATION_FAILED);
}
if (!establish(this))
{
charon->bus->alert(charon->bus, ALERT_PEER_AUTH_FAILED);
return send_notify(this, AUTHENTICATION_FAILED);
}
break;
}
/* check for and prepare mode config push/pull */
if (this->ph1->has_virtual_ip(this->ph1, this->peer_cfg))
{
if (this->peer_cfg->use_pull_mode(this->peer_cfg))
{
this->ike_sa->queue_task(this->ike_sa,
(task_t*)mode_config_create(this->ike_sa, TRUE, TRUE));
}
else
{
schedule_timeout(this->ike_sa);
}
}
else if (this->ph1->has_pool(this->ph1, this->peer_cfg))
{
if (this->peer_cfg->use_pull_mode(this->peer_cfg))
{
schedule_timeout(this->ike_sa);
}
else
{
this->ike_sa->queue_task(this->ike_sa,
(task_t*)mode_config_create(this->ike_sa, TRUE, FALSE));
}
}
return SUCCESS;
}
default:
return FAILED;
}
}
METHOD(task_t, process_r, status_t,
private_aggressive_mode_t *this, message_t *message)
{
switch (this->state)
{
case AM_INIT:
{
sa_payload_t *sa_payload;
id_payload_t *id_payload;
identification_t *id;
linked_list_t *list;
proposal_selection_flag_t flags = PROPOSAL_SKIP_PRIVATE;
uint16_t group;
this->ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
DBG0(DBG_IKE, "%H is initiating a Aggressive Mode IKE_SA",
message->get_source(message));
this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
this->ike_sa->update_hosts(this->ike_sa,
message->get_destination(message),
message->get_source(message),
UPDATE_HOSTS_FORCE_ADDRS);
sa_payload = (sa_payload_t*)message->get_payload(message,
PLV1_SECURITY_ASSOCIATION);
if (!sa_payload)
{
DBG1(DBG_IKE, "SA payload missing");
return send_notify(this, INVALID_PAYLOAD_TYPE);
}
if (!this->ph1->save_sa_payload(this->ph1, message))
{
return send_notify(this, INVALID_PAYLOAD_TYPE);
}
list = sa_payload->get_proposals(sa_payload);
if (!lib->settings->get_bool(lib->settings,
"%s.prefer_configured_proposals", TRUE, lib->ns))
{
flags = PROPOSAL_PREFER_SUPPLIED;
}
this->proposal = this->ike_cfg->select_proposal(this->ike_cfg, list,
flags);
list->destroy_offset(list, offsetof(proposal_t, destroy));
if (!this->proposal)
{
DBG1(DBG_IKE, "no proposal found");
return send_notify(this, NO_PROPOSAL_CHOSEN);
}
this->ike_sa->set_proposal(this->ike_sa, this->proposal);
this->method = sa_payload->get_auth_method(sa_payload);
this->lifetime = sa_payload->get_lifetime(sa_payload,
this->proposal);
switch (this->method)
{
case AUTH_XAUTH_INIT_PSK:
case AUTH_XAUTH_RESP_PSK:
case AUTH_PSK:
if (!lib->settings->get_bool(lib->settings, "%s.i_dont_care"
"_about_security_and_use_aggressive_mode_psk",
FALSE, lib->ns))
{
DBG1(DBG_IKE, "Aggressive Mode PSK disabled for "
"security reasons");
charon->bus->alert(charon->bus, ALERT_PEER_AUTH_FAILED);
return send_notify(this, AUTHENTICATION_FAILED);
}
break;
default:
break;
}
if (!this->proposal->get_algorithm(this->proposal,
DIFFIE_HELLMAN_GROUP, &group, NULL))
{
DBG1(DBG_IKE, "DH group selection failed");
return send_notify(this, INVALID_KEY_INFORMATION);
}
if (!this->ph1->create_dh(this->ph1, group))
{
DBG1(DBG_IKE, "negotiated DH group not supported");
return send_notify(this, INVALID_KEY_INFORMATION);
}
if (!this->ph1->get_nonce_ke(this->ph1, message))
{
return send_notify(this, INVALID_PAYLOAD_TYPE);
}
id_payload = (id_payload_t*)message->get_payload(message, PLV1_ID);
if (!id_payload)
{
DBG1(DBG_IKE, "IDii payload missing");
charon->bus->alert(charon->bus, ALERT_PEER_AUTH_FAILED);
return send_notify(this, INVALID_PAYLOAD_TYPE);
}
id = id_payload->get_identification(id_payload);
this->id_data = id_payload->get_encoded(id_payload);
this->ike_sa->set_other_id(this->ike_sa, id);
this->peer_cfg = this->ph1->select_config(this->ph1,
this->method, TRUE, id);
if (!this->peer_cfg)
{
charon->bus->alert(charon->bus, ALERT_PEER_AUTH_FAILED);
return send_notify(this, AUTHENTICATION_FAILED);
}
this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
this->state = AM_AUTH;
if (has_notify_errors(this, message))
{
return FAILED;
}
return NEED_MORE;
}
case AM_AUTH:
{
adopt_children_job_t *job = NULL;
xauth_t *xauth = NULL;
while (TRUE)
{
if (this->ph1->verify_auth(this->ph1, this->method, message,
chunk_clone(this->id_data)))
{
break;
}
this->peer_cfg->destroy(this->peer_cfg);
this->peer_cfg = this->ph1->select_config(this->ph1,
this->method, TRUE, NULL);
if (!this->peer_cfg)
{
charon->bus->alert(charon->bus, ALERT_PEER_AUTH_FAILED);
return send_delete(this);
}
this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
}
if (!charon->bus->authorize(charon->bus, FALSE))
{
DBG1(DBG_IKE, "Aggressive Mode authorization hook forbids "
"IKE_SA, canceling");
charon->bus->alert(charon->bus, ALERT_PEER_AUTH_FAILED);
return send_delete(this);
}
switch (this->method)
{
case AUTH_XAUTH_INIT_PSK:
case AUTH_XAUTH_INIT_RSA:
case AUTH_HYBRID_INIT_RSA:
xauth = xauth_create(this->ike_sa, TRUE);
this->ike_sa->queue_task(this->ike_sa, (task_t*)xauth);
break;
case AUTH_XAUTH_RESP_PSK:
case AUTH_XAUTH_RESP_RSA:
case AUTH_HYBRID_RESP_RSA:
/* wait for XAUTH request */
break;
default:
if (charon->ike_sa_manager->check_uniqueness(
charon->ike_sa_manager, this->ike_sa, FALSE))
{
DBG1(DBG_IKE, "canceling Aggressive Mode due to "
"uniqueness policy");
return send_delete(this);
}
if (!establish(this))
{
charon->bus->alert(charon->bus, ALERT_PEER_AUTH_FAILED);
return send_delete(this);
}
job = adopt_children_job_create(
this->ike_sa->get_id(this->ike_sa));
break;
}
/* check for and prepare mode config push/pull */
if (this->ph1->has_virtual_ip(this->ph1, this->peer_cfg))
{
if (this->peer_cfg->use_pull_mode(this->peer_cfg))
{
this->ike_sa->queue_task(this->ike_sa,
(task_t*)mode_config_create(this->ike_sa, TRUE, TRUE));
}
}
else if (this->ph1->has_pool(this->ph1, this->peer_cfg))
{
if (!this->peer_cfg->use_pull_mode(this->peer_cfg))
{
if (job)
{
job->queue_task(job, (task_t*)
mode_config_create(this->ike_sa, TRUE, FALSE));
}
else if (xauth)
{
xauth->queue_mode_config_push(xauth);
}
else
{
this->ike_sa->queue_task(this->ike_sa, (task_t*)
mode_config_create(this->ike_sa, TRUE, FALSE));
}
}
}
if (job)
{
lib->processor->queue_job(lib->processor, (job_t*)job);
}
return SUCCESS;
}
default:
return FAILED;
}
}
METHOD(task_t, build_r, status_t,
private_aggressive_mode_t *this, message_t *message)
{
if (this->state == AM_AUTH)
{
sa_payload_t *sa_payload;
id_payload_t *id_payload;
identification_t *id;
sa_payload = sa_payload_create_from_proposal_v1(this->proposal,
this->lifetime, 0, this->method, MODE_NONE,
ENCAP_NONE, 0);
message->add_payload(message, &sa_payload->payload_interface);
if (!this->ph1->add_nonce_ke(this->ph1, message))
{
return send_notify(this, INVALID_KEY_INFORMATION);
}
if (!this->ph1->create_hasher(this->ph1))
{
return send_notify(this, NO_PROPOSAL_CHOSEN);
}
if (!this->ph1->derive_keys(this->ph1, this->peer_cfg, this->method))
{
return send_notify(this, INVALID_KEY_INFORMATION);
}
id = this->ph1->get_id(this->ph1, this->peer_cfg, TRUE);
this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
id_payload = id_payload_create_from_identification(PLV1_ID, id);
message->add_payload(message, &id_payload->payload_interface);
if (!this->ph1->build_auth(this->ph1, this->method, message,
id_payload->get_encoded(id_payload)))
{
charon->bus->alert(charon->bus, ALERT_LOCAL_AUTH_FAILED);
return send_notify(this, AUTHENTICATION_FAILED);
}
return NEED_MORE;
}
return FAILED;
}
METHOD(task_t, process_i, status_t,
private_aggressive_mode_t *this, message_t *message)
{
if (this->state == AM_AUTH)
{
auth_method_t method;
sa_payload_t *sa_payload;
id_payload_t *id_payload;
identification_t *id, *cid;
linked_list_t *list;
uint32_t lifetime;
sa_payload = (sa_payload_t*)message->get_payload(message,
PLV1_SECURITY_ASSOCIATION);
if (!sa_payload)
{
DBG1(DBG_IKE, "SA payload missing");
return send_notify(this, INVALID_PAYLOAD_TYPE);
}
list = sa_payload->get_proposals(sa_payload);
this->proposal = this->ike_cfg->select_proposal(this->ike_cfg, list, 0);
list->destroy_offset(list, offsetof(proposal_t, destroy));
if (!this->proposal)
{
DBG1(DBG_IKE, "no proposal found");
return send_notify(this, NO_PROPOSAL_CHOSEN);
}
this->ike_sa->set_proposal(this->ike_sa, this->proposal);
lifetime = sa_payload->get_lifetime(sa_payload, this->proposal);
if (lifetime != this->lifetime)
{
DBG1(DBG_IKE, "received lifetime %us does not match configured "
"lifetime %us", lifetime, this->lifetime);
}
this->lifetime = lifetime;
method = sa_payload->get_auth_method(sa_payload);
if (method != this->method)
{
DBG1(DBG_IKE, "received %N authentication, but configured %N, "
"continue with configured", auth_method_names, method,
auth_method_names, this->method);
}
if (!this->ph1->get_nonce_ke(this->ph1, message))
{
return send_notify(this, INVALID_PAYLOAD_TYPE);
}
if (!this->ph1->create_hasher(this->ph1))
{
return send_notify(this, NO_PROPOSAL_CHOSEN);
}
id_payload = (id_payload_t*)message->get_payload(message, PLV1_ID);
if (!id_payload)
{
DBG1(DBG_IKE, "IDir payload missing");
charon->bus->alert(charon->bus, ALERT_PEER_AUTH_FAILED);
return send_delete(this);
}
id = id_payload->get_identification(id_payload);
cid = this->ph1->get_id(this->ph1, this->peer_cfg, FALSE);
if (cid && !id->matches(id, cid))
{
DBG1(DBG_IKE, "IDir '%Y' does not match to '%Y'", id, cid);
id->destroy(id);
charon->bus->alert(charon->bus, ALERT_PEER_AUTH_FAILED);
return send_notify(this, INVALID_ID_INFORMATION);
}
this->ike_sa->set_other_id(this->ike_sa, id);
if (!this->ph1->derive_keys(this->ph1, this->peer_cfg, this->method))
{
return send_notify(this, INVALID_KEY_INFORMATION);
}
if (!this->ph1->verify_auth(this->ph1, this->method, message,
id_payload->get_encoded(id_payload)))
{
charon->bus->alert(charon->bus, ALERT_PEER_AUTH_FAILED);
return send_notify(this, AUTHENTICATION_FAILED);
}
if (!charon->bus->authorize(charon->bus, FALSE))
{
DBG1(DBG_IKE, "Aggressive Mode authorization hook forbids IKE_SA, "
"canceling");
return send_notify(this, AUTHENTICATION_FAILED);
}
return NEED_MORE;
}
return FAILED;
}
METHOD(task_t, get_type, task_type_t,
private_aggressive_mode_t *this)
{
return TASK_AGGRESSIVE_MODE;
}
METHOD(task_t, migrate, void,
private_aggressive_mode_t *this, ike_sa_t *ike_sa)
{
DESTROY_IF(this->peer_cfg);
DESTROY_IF(this->proposal);
this->ph1->destroy(this->ph1);
chunk_free(&this->id_data);
this->ike_sa = ike_sa;
this->state = AM_INIT;
this->peer_cfg = NULL;
this->proposal = NULL;
this->ph1 = phase1_create(ike_sa, this->initiator);
}
METHOD(task_t, destroy, void,
private_aggressive_mode_t *this)
{
DESTROY_IF(this->peer_cfg);
DESTROY_IF(this->proposal);
this->ph1->destroy(this->ph1);
chunk_free(&this->id_data);
free(this);
}
/*
* Described in header.
*/
aggressive_mode_t *aggressive_mode_create(ike_sa_t *ike_sa, bool initiator)
{
private_aggressive_mode_t *this;
INIT(this,
.public = {
.task = {
.get_type = _get_type,
.migrate = _migrate,
.destroy = _destroy,
},
},
.ike_sa = ike_sa,
.ph1 = phase1_create(ike_sa, initiator),
.initiator = initiator,
.state = AM_INIT,
);
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;
}
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