525 lines
12 KiB
C
525 lines
12 KiB
C
/*
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* Copyright (C) 2008 Tobias Brunner
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* Copyright (C) 2006-2009 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "ike_cert_pre.h"
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#include <daemon.h>
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#include <sa/ike_sa.h>
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#include <encoding/payloads/cert_payload.h>
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#include <encoding/payloads/certreq_payload.h>
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#include <credentials/certificates/x509.h>
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typedef struct private_ike_cert_pre_t private_ike_cert_pre_t;
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/**
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* Private members of a ike_cert_pre_t task.
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*/
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struct private_ike_cert_pre_t {
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/**
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* Public methods and task_t interface.
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*/
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ike_cert_pre_t public;
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/**
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* Assigned IKE_SA.
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*/
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ike_sa_t *ike_sa;
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/**
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* Are we the initiator?
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*/
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bool initiator;
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/**
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* Do we accept HTTP certificate lookup requests
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*/
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bool do_http_lookup;
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/**
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* wheter this is the final authentication round
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*/
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bool final;
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};
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/**
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* read certificate requests
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*/
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static void process_certreqs(private_ike_cert_pre_t *this, message_t *message)
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{
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enumerator_t *enumerator;
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payload_t *payload;
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auth_cfg_t *auth;
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auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
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enumerator = message->create_payload_enumerator(message);
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while (enumerator->enumerate(enumerator, &payload))
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{
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switch (payload->get_type(payload))
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{
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case CERTIFICATE_REQUEST:
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{
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certreq_payload_t *certreq = (certreq_payload_t*)payload;
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enumerator_t *enumerator;
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chunk_t keyid;
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this->ike_sa->set_condition(this->ike_sa, COND_CERTREQ_SEEN, TRUE);
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if (certreq->get_cert_type(certreq) != CERT_X509)
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{
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DBG1(DBG_IKE, "cert payload %N not supported - ignored",
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certificate_type_names, certreq->get_cert_type(certreq));
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break;
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}
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enumerator = certreq->create_keyid_enumerator(certreq);
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while (enumerator->enumerate(enumerator, &keyid))
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{
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identification_t *id;
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certificate_t *cert;
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id = identification_create_from_encoding(ID_KEY_ID, keyid);
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cert = lib->credmgr->get_cert(lib->credmgr,
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CERT_X509, KEY_ANY, id, TRUE);
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if (cert)
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{
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DBG1(DBG_IKE, "received cert request for \"%Y\"",
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cert->get_subject(cert));
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auth->add(auth, AUTH_RULE_CA_CERT, cert);
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}
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else
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{
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DBG1(DBG_IKE, "received cert request for unknown ca "
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"with keyid %Y", id);
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}
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id->destroy(id);
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}
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enumerator->destroy(enumerator);
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break;
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}
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case NOTIFY:
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{
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notify_payload_t *notify = (notify_payload_t*)payload;
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/* we only handle one type of notify here */
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if (notify->get_notify_type(notify) == HTTP_CERT_LOOKUP_SUPPORTED)
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{
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this->ike_sa->enable_extension(this->ike_sa, EXT_HASH_AND_URL);
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}
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break;
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}
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default:
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/* ignore other payloads here, these are handled elsewhere */
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break;
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}
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}
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enumerator->destroy(enumerator);
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}
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/**
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* tries to extract a certificate from the cert payload or the credential
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* manager (based on the hash of a "Hash and URL" encoded cert).
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* Note: the returned certificate (if any) has to be destroyed
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*/
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static certificate_t *try_get_cert(cert_payload_t *cert_payload)
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{
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certificate_t *cert = NULL;
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switch (cert_payload->get_cert_encoding(cert_payload))
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{
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case ENC_X509_SIGNATURE:
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{
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cert = cert_payload->get_cert(cert_payload);
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break;
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}
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case ENC_X509_HASH_AND_URL:
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{
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identification_t *id;
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chunk_t hash = cert_payload->get_hash(cert_payload);
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if (!hash.ptr)
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{
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/* invalid "Hash and URL" data (logged elsewhere) */
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break;
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}
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id = identification_create_from_encoding(ID_KEY_ID, hash);
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cert = lib->credmgr->get_cert(lib->credmgr,
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CERT_X509, KEY_ANY, id, FALSE);
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id->destroy(id);
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break;
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}
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default:
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{
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break;
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}
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}
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return cert;
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}
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/**
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* import certificates
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*/
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static void process_certs(private_ike_cert_pre_t *this, message_t *message)
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{
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enumerator_t *enumerator;
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payload_t *payload;
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auth_cfg_t *auth;
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bool first = TRUE;
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auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
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enumerator = message->create_payload_enumerator(message);
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while (enumerator->enumerate(enumerator, &payload))
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{
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if (payload->get_type(payload) == CERTIFICATE)
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{
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cert_payload_t *cert_payload;
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cert_encoding_t encoding;
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certificate_t *cert;
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char *url;
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cert_payload = (cert_payload_t*)payload;
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encoding = cert_payload->get_cert_encoding(cert_payload);
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switch (encoding)
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{
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case ENC_X509_HASH_AND_URL:
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{
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if (!this->do_http_lookup)
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{
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DBG1(DBG_IKE, "received hash-and-url encoded cert, but"
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" we don't accept them, ignore");
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break;
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}
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/* FALL */
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}
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case ENC_X509_SIGNATURE:
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{
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cert = try_get_cert(cert_payload);
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if (cert)
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{
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if (first)
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{ /* the first is an end entity certificate */
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DBG1(DBG_IKE, "received end entity cert \"%Y\"",
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cert->get_subject(cert));
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auth->add(auth, AUTH_HELPER_SUBJECT_CERT, cert);
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first = FALSE;
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}
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else
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{
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DBG1(DBG_IKE, "received issuer cert \"%Y\"",
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cert->get_subject(cert));
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auth->add(auth, AUTH_HELPER_IM_CERT, cert);
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}
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}
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else if (encoding == ENC_X509_HASH_AND_URL)
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{
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/* we fetch the certificate not yet, but only if
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* it is really needed during authentication */
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url = cert_payload->get_url(cert_payload);
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if (!url)
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{
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DBG1(DBG_IKE, "received invalid hash-and-url "
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"encoded cert, ignore");
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break;
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}
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url = strdup(url);
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if (first)
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{ /* first URL is for an end entity certificate */
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DBG1(DBG_IKE, "received hash-and-url for end"
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" entity cert \"%s\"", url);
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auth->add(auth, AUTH_HELPER_SUBJECT_HASH_URL, url);
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first = FALSE;
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}
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else
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{
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DBG1(DBG_IKE, "received hash-and-url for issuer"
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" cert \"%s\"", url);
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auth->add(auth, AUTH_HELPER_IM_HASH_URL, url);
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}
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}
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break;
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}
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case ENC_PKCS7_WRAPPED_X509:
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case ENC_PGP:
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case ENC_DNS_SIGNED_KEY:
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case ENC_KERBEROS_TOKEN:
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case ENC_CRL:
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case ENC_ARL:
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case ENC_SPKI:
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case ENC_X509_ATTRIBUTE:
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case ENC_RAW_RSA_KEY:
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case ENC_X509_HASH_AND_URL_BUNDLE:
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case ENC_OCSP_CONTENT:
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default:
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DBG1(DBG_ENC, "certificate encoding %N not supported",
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cert_encoding_names, encoding);
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}
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}
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}
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enumerator->destroy(enumerator);
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}
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/**
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* add the keyid of a certificate to the certificate request payload
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*/
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static void add_certreq(certreq_payload_t **req, certificate_t *cert)
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{
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switch (cert->get_type(cert))
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{
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case CERT_X509:
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{
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public_key_t *public;
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chunk_t keyid;
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x509_t *x509 = (x509_t*)cert;
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if (!(x509->get_flags(x509) & X509_CA))
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{ /* no CA cert, skip */
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break;
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}
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public = cert->get_public_key(cert);
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if (!public)
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{
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break;
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}
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if (*req == NULL)
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{
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*req = certreq_payload_create_type(CERT_X509);
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}
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if (public->get_fingerprint(public, KEYID_PUBKEY_INFO_SHA1, &keyid))
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{
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(*req)->add_keyid(*req, keyid);
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DBG1(DBG_IKE, "sending cert request for \"%Y\"",
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cert->get_subject(cert));
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}
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public->destroy(public);
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break;
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}
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default:
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break;
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}
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}
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/**
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* add a auth_cfg's CA certificates to the certificate request
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*/
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static void add_certreqs(certreq_payload_t **req, auth_cfg_t *auth)
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{
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enumerator_t *enumerator;
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auth_rule_t type;
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void *value;
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enumerator = auth->create_enumerator(auth);
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while (enumerator->enumerate(enumerator, &type, &value))
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{
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switch (type)
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{
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case AUTH_RULE_CA_CERT:
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add_certreq(req, (certificate_t*)value);
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break;
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default:
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break;
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}
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}
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enumerator->destroy(enumerator);
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}
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/**
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* build certificate requests
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*/
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static void build_certreqs(private_ike_cert_pre_t *this, message_t *message)
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{
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enumerator_t *enumerator;
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ike_cfg_t *ike_cfg;
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peer_cfg_t *peer_cfg;
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certificate_t *cert;
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auth_cfg_t *auth;
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certreq_payload_t *req = NULL;
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ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
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if (!ike_cfg->send_certreq(ike_cfg))
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{
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return;
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}
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/* check if we require a specific CA for that peer */
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peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
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if (peer_cfg)
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{
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enumerator = peer_cfg->create_auth_cfg_enumerator(peer_cfg, FALSE);
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while (enumerator->enumerate(enumerator, &auth))
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{
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add_certreqs(&req, auth);
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}
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enumerator->destroy(enumerator);
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}
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if (!req)
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{
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/* otherwise add all trusted CA certificates */
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enumerator = lib->credmgr->create_cert_enumerator(lib->credmgr,
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CERT_ANY, KEY_ANY, NULL, TRUE);
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while (enumerator->enumerate(enumerator, &cert))
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{
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add_certreq(&req, cert);
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}
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enumerator->destroy(enumerator);
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}
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if (req)
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{
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message->add_payload(message, (payload_t*)req);
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if (lib->settings->get_bool(lib->settings, "charon.hash_and_url", FALSE))
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{
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message->add_notify(message, FALSE, HTTP_CERT_LOOKUP_SUPPORTED,
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chunk_empty);
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this->do_http_lookup = TRUE;
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}
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}
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}
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/**
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* Check if this is the final authentication round
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*/
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static bool final_auth(message_t *message)
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{
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/* we check for an AUTH payload without a ANOTHER_AUTH_FOLLOWS notify */
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if (message->get_payload(message, AUTHENTICATION) == NULL)
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{
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return FALSE;
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}
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if (message->get_notify(message, ANOTHER_AUTH_FOLLOWS))
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{
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return FALSE;
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}
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return TRUE;
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}
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/**
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* Implementation of task_t.process for initiator
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*/
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static status_t build_i(private_ike_cert_pre_t *this, message_t *message)
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{
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if (message->get_message_id(message) == 1)
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{ /* initiator sends CERTREQs in first IKE_AUTH */
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build_certreqs(this, message);
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}
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.process for responder
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*/
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static status_t process_r(private_ike_cert_pre_t *this, message_t *message)
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{
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if (message->get_exchange_type(message) != IKE_SA_INIT)
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{ /* handle certreqs/certs in any IKE_AUTH, just in case */
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process_certreqs(this, message);
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process_certs(this, message);
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}
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this->final = final_auth(message);
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.build for responder
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*/
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static status_t build_r(private_ike_cert_pre_t *this, message_t *message)
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{
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if (message->get_exchange_type(message) == IKE_SA_INIT)
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{
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build_certreqs(this, message);
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}
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if (this->final)
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{
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return SUCCESS;
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}
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.process for initiator
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*/
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static status_t process_i(private_ike_cert_pre_t *this, message_t *message)
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{
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if (message->get_exchange_type(message) == IKE_SA_INIT)
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{
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process_certreqs(this, message);
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}
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process_certs(this, message);
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if (final_auth(message))
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{
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return SUCCESS;
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}
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.get_type
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*/
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static task_type_t get_type(private_ike_cert_pre_t *this)
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{
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return IKE_CERT_PRE;
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}
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/**
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* Implementation of task_t.migrate
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*/
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static void migrate(private_ike_cert_pre_t *this, ike_sa_t *ike_sa)
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{
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this->ike_sa = ike_sa;
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}
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/**
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* Implementation of task_t.destroy
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*/
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static void destroy(private_ike_cert_pre_t *this)
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{
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free(this);
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}
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/*
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* Described in header.
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*/
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ike_cert_pre_t *ike_cert_pre_create(ike_sa_t *ike_sa, bool initiator)
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{
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private_ike_cert_pre_t *this = malloc_thing(private_ike_cert_pre_t);
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this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
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this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
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this->public.task.destroy = (void(*)(task_t*))destroy;
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if (initiator)
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{
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this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
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this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
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}
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else
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{
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this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
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this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
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}
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this->ike_sa = ike_sa;
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this->initiator = initiator;
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this->do_http_lookup = FALSE;
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this->final = FALSE;
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return &this->public;
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}
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