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/* Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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 3 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include "libdnssec/key.h"
#include "libdnssec/sign.h"
#include "knot/dnssec/context.h"
#include "knot/dnssec/zone-keys.h"
#include "libknot/rrset.h"
/*!
* \brief Create RRSIG RR for given RR set.
*
* \param rrsigs RR set with RRSIGs into which the result will be added.
* \param covered RR set to create a new signature for.
* \param key Signing key.
* \param sign_ctx Signing context.
* \param dnssec_ctx DNSSEC context.
* \param mm Memory context.
* \param expires Out: When will the new RRSIG expire.
*
* \return Error code, KNOT_EOK if successful.
*/
int knot_sign_rrset(knot_rrset_t *rrsigs,
const knot_rrset_t *covered,
const dnssec_key_t *key,
dnssec_sign_ctx_t *sign_ctx,
const kdnssec_ctx_t *dnssec_ctx,
knot_mm_t *mm,
knot_time_t *expires);
/*!
* \brief Create RRSIG RR for given RR set, choose which key to use.
*
* \param rrsigs RR set with RRSIGs into which the result will be added.
* \param rrset RR set to create a new signature for.
* \param sign_ctx Zone signing context.
* \param mm Memory context.
*
* \return Error code, KNOT_EOK if successful.
*/
int knot_sign_rrset2(knot_rrset_t *rrsigs,
const knot_rrset_t *rrset,
zone_sign_ctx_t *sign_ctx,
knot_mm_t *mm);
/*!
* \brief Add all data covered by signature into signing context.
*
* RFC 4034: The signature covers RRSIG RDATA field (excluding the signature)
* and all matching RR records, which are ordered canonically.
*
* Requires all DNAMEs in canonical form and all RRs ordered canonically.
*
* \param ctx Signing context.
* \param rrsig_rdata RRSIG RDATA with populated fields except signature.
* \param covered Covered RRs.
*
* \return Error code, KNOT_EOK if successful.
*/
int knot_sign_ctx_add_data(dnssec_sign_ctx_t *ctx,
const uint8_t *rrsig_rdata,
const knot_rrset_t *covered);
/*!
* \brief Creates new RRS using \a rrsig_rrs as a source. Only those RRs that
* cover given \a type are copied into \a out_sig
*
* \note If given \a type is ANY, put a random subset, not all.
*
* \param type Covered type.
* \param rrsig_rrs Source RRS.
* \param out_sig Output RRS.
* \param mm Memory context.
*
* \retval KNOT_EOK if some RRSIG was found.
* \retval KNOT_EINVAL if no RRSIGs were found.
* \retval Error code other than EINVAL on error.
*/
int knot_synth_rrsig(uint16_t type, const knot_rdataset_t *rrsig_rrs,
knot_rdataset_t *out_sig, knot_mm_t *mm);
/*!
* \brief Determines if a RRSIG exists, covering the specified type.
*/
bool knot_synth_rrsig_exists(uint16_t type, const knot_rdataset_t *rrsig_rrs);
/*!
* \brief Check if RRSIG signature is valid.
*
* \param covered RRs covered by the signature.
* \param rrsigs RR set with RRSIGs.
* \param pos Number of RRSIG RR in 'rrsigs' to be validated.
* \param key Signing key.
* \param sign_ctx Signing context.
* \param dnssec_ctx DNSSEC context.
* \param refresh Consider RRSIG expired when gonna expire this soon.
* \param skip_crypto All RRSIGs in this node have been verified, just check validity.
*
* \return Error code, KNOT_EOK if successful and the signature is valid.
* \retval KNOT_DNSSEC_EINVALID_SIGNATURE The signature is invalid.
*/
int knot_check_signature(const knot_rrset_t *covered,
const knot_rrset_t *rrsigs, size_t pos,
const dnssec_key_t *key,
dnssec_sign_ctx_t *sign_ctx,
const kdnssec_ctx_t *dnssec_ctx,
knot_timediff_t refresh,
bool skip_crypto);
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