/*
* Copyright (C) 2011 Martin Willi
* Copyright (C) 2011 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 "isakmp_cert_post.h"
#include <daemon.h>
#include <sa/ike_sa.h>
#include <encoding/payloads/cert_payload.h>
#include <encoding/payloads/certreq_payload.h>
#include <encoding/payloads/auth_payload.h>
#include <encoding/payloads/sa_payload.h>
#include <credentials/certificates/x509.h>
typedef struct private_isakmp_cert_post_t private_isakmp_cert_post_t;
/**
* Private members of a isakmp_cert_post_t task.
*/
struct private_isakmp_cert_post_t {
/**
* Public methods and task_t interface.
*/
isakmp_cert_post_t public;
/**
* Assigned IKE_SA.
*/
ike_sa_t *ike_sa;
/**
* Are we the initiator?
*/
bool initiator;
/**
* States of ike cert pre
*/
enum {
CR_SA,
CR_KE,
CR_AUTH,
} state;
};
/**
* Check if we actually use certificates for authentication
*/
static bool use_certs(private_isakmp_cert_post_t *this, message_t *message)
{
enumerator_t *enumerator;
payload_t *payload;
bool use = FALSE;
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
if (payload->get_type(payload) == PLV1_SECURITY_ASSOCIATION)
{
sa_payload_t *sa_payload = (sa_payload_t*)payload;
switch (sa_payload->get_auth_method(sa_payload))
{
case AUTH_RSA:
case AUTH_ECDSA_256:
case AUTH_ECDSA_384:
case AUTH_ECDSA_521:
case AUTH_XAUTH_INIT_RSA:
case AUTH_XAUTH_RESP_RSA:
case AUTH_HYBRID_INIT_RSA:
case AUTH_HYBRID_RESP_RSA:
use = TRUE;
break;
default:
break;
}
break;
}
}
enumerator->destroy(enumerator);
return use;
}
/**
* Add certificates to message
*/
static void build_certs(private_isakmp_cert_post_t *this, message_t *message)
{
peer_cfg_t *peer_cfg;
peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
if (!peer_cfg)
{
return;
}
switch (peer_cfg->get_cert_policy(peer_cfg))
{
case CERT_NEVER_SEND:
break;
case CERT_SEND_IF_ASKED:
if (!this->ike_sa->has_condition(this->ike_sa, COND_CERTREQ_SEEN))
{
break;
}
/* FALL */
case CERT_ALWAYS_SEND:
{
cert_payload_t *payload;
enumerator_t *enumerator;
certificate_t *cert;
auth_rule_t type;
auth_cfg_t *auth;
auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
cert = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
if (!cert)
{
break;
}
payload = cert_payload_create_from_cert(PLV1_CERTIFICATE, cert);
if (!payload)
{
break;
}
DBG1(DBG_IKE, "sending end entity cert \"%Y\"",
cert->get_subject(cert));
message->add_payload(message, (payload_t*)payload);
enumerator = auth->create_enumerator(auth);
while (enumerator->enumerate(enumerator, &type, &cert))
{
if (type == AUTH_RULE_IM_CERT)
{
payload = cert_payload_create_from_cert(PLV1_CERTIFICATE, cert);
if (payload)
{
DBG1(DBG_IKE, "sending issuer cert \"%Y\"",
cert->get_subject(cert));
message->add_payload(message, (payload_t*)payload);
}
}
}
enumerator->destroy(enumerator);
}
}
}
METHOD(task_t, build_i, status_t,
private_isakmp_cert_post_t *this, message_t *message)
{
switch (message->get_exchange_type(message))
{
case ID_PROT:
if (this->state == CR_AUTH)
{
build_certs(this, message);
return SUCCESS;
}
return NEED_MORE;
case AGGRESSIVE:
if (this->state == CR_AUTH)
{
build_certs(this, message);
return SUCCESS;
}
return NEED_MORE;
default:
return FAILED;
}
}
METHOD(task_t, process_r, status_t,
private_isakmp_cert_post_t *this, message_t *message)
{
switch (message->get_exchange_type(message))
{
case ID_PROT:
{
switch (this->state)
{
case CR_SA:
if (!use_certs(this, message))
{
return SUCCESS;
}
return NEED_MORE;
case CR_KE:
return NEED_MORE;
case CR_AUTH:
return NEED_MORE;
default:
return FAILED;
}
}
case AGGRESSIVE:
{
switch (this->state)
{
case CR_SA:
if (!use_certs(this, message))
{
return SUCCESS;
}
return NEED_MORE;
case CR_AUTH:
return SUCCESS;
default:
return FAILED;
}
}
default:
return FAILED;
}
}
METHOD(task_t, build_r, status_t,
private_isakmp_cert_post_t *this, message_t *message)
{
switch (message->get_exchange_type(message))
{
case ID_PROT:
switch (this->state)
{
case CR_SA:
this->state = CR_KE;
return NEED_MORE;
case CR_KE:
this->state = CR_AUTH;
return NEED_MORE;
case CR_AUTH:
build_certs(this, message);
return SUCCESS;
}
case AGGRESSIVE:
switch (this->state)
{
case CR_SA:
build_certs(this, message);
this->state = CR_AUTH;
return NEED_MORE;
case CR_AUTH:
return SUCCESS;
default:
return FAILED;
}
default:
return FAILED;
}
}
METHOD(task_t, process_i, status_t,
private_isakmp_cert_post_t *this, message_t *message)
{
switch (message->get_exchange_type(message))
{
case ID_PROT:
{
switch (this->state)
{
case CR_SA:
if (!use_certs(this, message))
{
return SUCCESS;
}
this->state = CR_KE;
return NEED_MORE;
case CR_KE:
this->state = CR_AUTH;
return NEED_MORE;
case CR_AUTH:
return SUCCESS;
default:
return FAILED;
}
}
case AGGRESSIVE:
{
if (this->state == CR_SA)
{
if (!use_certs(this, message))
{
return SUCCESS;
}
this->state = CR_AUTH;
return NEED_MORE;
}
return SUCCESS;
}
default:
return FAILED;
}
}
METHOD(task_t, get_type, task_type_t,
private_isakmp_cert_post_t *this)
{
return TASK_ISAKMP_CERT_POST;
}
METHOD(task_t, migrate, void,
private_isakmp_cert_post_t *this, ike_sa_t *ike_sa)
{
this->ike_sa = ike_sa;
this->state = CR_SA;
}
METHOD(task_t, destroy, void,
private_isakmp_cert_post_t *this)
{
free(this);
}
/*
* Described in header.
*/
isakmp_cert_post_t *isakmp_cert_post_create(ike_sa_t *ike_sa, bool initiator)
{
private_isakmp_cert_post_t *this;
INIT(this,
.public = {
.task = {
.get_type = _get_type,
.migrate = _migrate,
.destroy = _destroy,
},
},
.ike_sa = ike_sa,
.initiator = initiator,
.state = CR_SA,
);
if (initiator)
{
this->public.task.process = _process_i;
this->public.task.build = _build_i;
}
else
{
this->public.task.process = _process_r;
this->public.task.build = _build_r;
}
return &this->public;
}
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