Added ipseckey plugin, which provides support for public keys in IPSECKEY RRs
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Reto Guadagnini
committed by
Tobias Brunner
Tobias Brunner
parent
d786cbda5c
commit
a77bbc3b8c
@@ -0,0 +1,278 @@
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/*
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* Copyright (C) 2012 Reto Guadagnini
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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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#define _GNU_SOURCE
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#include <stdio.h>
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#include <string.h>
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#include "ipseckey_cred.h"
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#include "ipseckey.h"
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#include <bio/bio_reader.h>
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#include <daemon.h>
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typedef struct private_ipseckey_cred_t private_ipseckey_cred_t;
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/**
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* Private data of an ipseckey_cred_t object
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*/
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struct private_ipseckey_cred_t {
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/**
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* Public part
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*/
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ipseckey_cred_t public;
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/**
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* DNS resolver
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*/
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resolver_t *res;
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};
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/**
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* enumerator over certificates
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*/
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typedef struct {
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/** implements enumerator interface */
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enumerator_t public;
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/** inner enumerator (enumerates IPSECKEY resource records) */
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enumerator_t *inner;
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/** response of the DNS resolver which contains the IPSECKEYs */
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resolver_response_t *response;
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/* IPSECKEYs are not valid before this point in time */
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time_t notBefore;
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/* IPSECKEYs are not valid after this point in time */
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time_t notAfter;
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/* identity to which the IPSECKEY belongs */
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identification_t *identity;
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} cert_enumerator_t;
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METHOD(enumerator_t, cert_enumerator_enumerate, bool,
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cert_enumerator_t *this, certificate_t **cert)
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{
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rr_t *cur_rr = NULL;
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ipseckey_t *cur_ipseckey = NULL;
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chunk_t pub_key;
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public_key_t * key = NULL;
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bool supported_ipseckey_found = FALSE;
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DBG1(DBG_CFG, "ipseckey_cred: Enumerating over IPSECKEY certificates");
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/* Get the next supported IPSECKEY using the inner enumerator. */
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while (this->inner->enumerate(this->inner, &cur_rr) &&
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!supported_ipseckey_found)
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{
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supported_ipseckey_found = TRUE;
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cur_ipseckey = ipseckey_create_frm_rr(cur_rr);
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if (!cur_ipseckey)
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{
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DBG1(DBG_CFG, "ipseckey_cred: Error while parsing an IPSECKEY. "
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"Skipping this key");
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supported_ipseckey_found = FALSE;
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}
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if (cur_ipseckey &&
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cur_ipseckey->get_algorithm(cur_ipseckey) != IPSECKEY_ALGORITHM_RSA)
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{
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DBG1(DBG_CFG, "ipseckey_cred: Skipping an IPSECKEY which uses an "
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"unsupported algorithm");
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cur_ipseckey->destroy(cur_ipseckey);
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supported_ipseckey_found = FALSE;
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}
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}
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if (supported_ipseckey_found)
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{
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/*
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* Wrap the key of the IPSECKEY in a certificate and return this
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* certificate.
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*/
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pub_key = cur_ipseckey->get_public_key(cur_ipseckey);
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key = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_RSA,
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BUILD_BLOB_DNSKEY, pub_key,
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BUILD_END);
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if (!key)
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{
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DBG1(DBG_CFG, "ipseckey_cred: Failed to create a public key "
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"from the IPSECKEY");
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cur_ipseckey->destroy(cur_ipseckey);
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return FALSE;
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}
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*cert = lib->creds->create(lib->creds, CRED_CERTIFICATE,
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CERT_TRUSTED_PUBKEY,
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BUILD_PUBLIC_KEY, key,
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BUILD_SUBJECT, this->identity,
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BUILD_NOT_BEFORE_TIME, this->notBefore,
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BUILD_NOT_AFTER_TIME, this->notAfter,
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BUILD_END);
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return TRUE;
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}
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return FALSE;
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}
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METHOD(enumerator_t, cert_enumerator_destroy, void,
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cert_enumerator_t *this)
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{
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this->inner->destroy(this->inner);
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this->response->destroy(this->response);
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free(this);
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}
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METHOD(credential_set_t, create_cert_enumerator, enumerator_t*,
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private_ipseckey_cred_t *this, certificate_type_t cert, key_type_t key,
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identification_t *id, bool trusted)
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{
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char *fqdn = NULL;
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resolver_response_t *response = NULL;
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rr_set_t *rrset = NULL;
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enumerator_t *rrsig_enum = NULL;
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rr_t *rrsig = NULL;
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bio_reader_t *reader = NULL;
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chunk_t ignore;
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u_int32_t nBefore, nAfter;
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cert_enumerator_t *e;
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if (id && id->get_type(id) == ID_FQDN)
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{
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/** Query the DNS for the required IPSECKEY RRs */
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if (0 >= asprintf(&fqdn, "%Y", id))
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{
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DBG1(DBG_CFG, "ipseckey_cred: ID is empty");
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return enumerator_create_empty();
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}
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DBG1(DBG_CFG, "ipseckey_cred: Performing a DNS query for the IPSECKEY "
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"RRs of the domain %s", fqdn);
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response = this->res->query(this->res, fqdn, RR_CLASS_IN,
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RR_TYPE_IPSECKEY);
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if (!response)
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{
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DBG1(DBG_CFG, "ipseckey_cred: DNS query failed");
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free(fqdn);
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return enumerator_create_empty();
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}
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if (!response->has_data(response) ||
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!response->query_name_exist(response) ||
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!(response->get_security_state(response) == SECURE) )
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{
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DBG1(DBG_CFG, "ipseckey_cred: Unable to retrieve IPSECKEY RRs "
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"for the domain %s from the DNS", fqdn);
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response->destroy(response);
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free(fqdn);
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return enumerator_create_empty();
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}
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free(fqdn);
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/** Determine the validity period of the retrieved IPSECKEYs
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*
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* We use the "Signature Inception" and "Signature Expiration" field
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* of the RRSIG resource record to determine the validity period of the
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* IPSECKEY RRs.
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*/
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rrset = response->get_rr_set(response);
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rrsig_enum = rrset->create_rrsig_enumerator(rrset);
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if (!rrsig_enum)
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{
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DBG1(DBG_CFG, "ipseckey_cred: Unable to determine the validity "
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"period of the RRs, because there are "
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"no RRSIGs present");
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response->destroy(response);
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return enumerator_create_empty();
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}
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/**
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* Currently we use the first RRSIG of the IPSECKEY RRset
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* to determine the validity period of the IPSECKEYs.
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* TODO: Take multiple RRSIGs into account.
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*/
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if (!rrsig_enum->enumerate(rrsig_enum, &rrsig))
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{
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DBG1(DBG_CFG, "ipseckey_cred: Unable to determine the validity "
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"period of the IPSECKEY RRs, because there are "
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"no RRSIGs present");
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rrsig_enum->destroy(rrsig_enum);
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response->destroy(response);
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return enumerator_create_empty();
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}
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/**
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* Parse the RRSIG for its validity period.
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* For the format of a RRSIG see RFC 4034.
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*/
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reader = bio_reader_create(rrsig->get_rdata(rrsig));
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reader->read_data(reader, 8, &ignore);
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reader->read_uint32(reader, &nAfter);
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reader->read_uint32(reader, &nBefore);
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reader->destroy(reader);
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/** Create and return an iterator over the retrieved IPSECKEYs */
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INIT(e,
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.public = {
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.enumerate = (void*)_cert_enumerator_enumerate,
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.destroy = _cert_enumerator_destroy,
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},
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.inner = response->get_rr_set(response)->create_rr_enumerator(
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response->get_rr_set(response)),
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.response = response,
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.notBefore = nBefore,
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.notAfter = nAfter,
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.identity = id,
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);
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return &e->public;
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}
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return enumerator_create_empty();
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}
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METHOD(ipseckey_cred_t, destroy, void,
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private_ipseckey_cred_t *this)
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{
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this->res->destroy(this->res);
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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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ipseckey_cred_t *ipseckey_cred_create(resolver_t *res)
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{
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private_ipseckey_cred_t *this;
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INIT(this,
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.public = {
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.set = {
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.create_private_enumerator = (void*)return_null,
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.create_cert_enumerator = _create_cert_enumerator,
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.create_shared_enumerator = (void*)return_null,
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.create_cdp_enumerator = (void*)return_null,
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.cache_cert = (void*)nop,
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},
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.destroy = _destroy,
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},
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.res = res,
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);
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return &this->public;
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}
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