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/* Copyright (C) 2021 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 "libknot/dynarray.h"
#include "libdnssec/keystore.h"
#include "libdnssec/sign.h"
#include "knot/dnssec/kasp/kasp_zone.h"
#include "knot/dnssec/kasp/policy.h"
#include "knot/dnssec/context.h"
/*!
* \brief Zone key context used during signing.
*/
typedef struct {
const char *id;
dnssec_key_t *key;
dnssec_binary_t precomputed_ds;
dnssec_key_digest_t precomputed_digesttype;
knot_time_t next_event;
bool is_ksk;
bool is_zsk;
bool is_active;
bool is_public;
bool is_ready;
bool is_zsk_active_plus;
bool is_ksk_active_plus;
bool is_pub_only;
bool is_revoked;
} zone_key_t;
knot_dynarray_declare(keyptr, zone_key_t *, DYNARRAY_VISIBILITY_NORMAL, 1)
typedef struct {
size_t count;
zone_key_t *keys;
} zone_keyset_t;
/*!
* \brief Signing context used for single signing thread.
*/
typedef struct {
size_t count; // number of keys in keyset
zone_key_t *keys; // keys in keyset
dnssec_sign_ctx_t **sign_ctxs; // signing buffers for keys in keyset
const kdnssec_ctx_t *dnssec_ctx; // dnssec context
} zone_sign_ctx_t;
/*!
* \brief Flags determining key type
*/
enum {
DNSKEY_FLAGS_ZSK = KNOT_DNSKEY_FLAG_ZONE,
DNSKEY_FLAGS_KSK = KNOT_DNSKEY_FLAG_ZONE | KNOT_DNSKEY_FLAG_SEP,
DNSKEY_FLAGS_REVOKED = KNOT_DNSKEY_FLAG_ZONE | KNOT_DNSKEY_FLAG_SEP | KNOT_DNSKEY_FLAG_REVOKE,
};
inline static uint16_t dnskey_flags(bool is_ksk)
{
return is_ksk ? DNSKEY_FLAGS_KSK : DNSKEY_FLAGS_ZSK;
}
typedef enum {
DNSKEY_GENERATE_KSK = (1 << 0), // KSK flag in metadata
DNSKEY_GENERATE_ZSK = (1 << 1), // ZSK flag in metadata
DNSKEY_GENERATE_SEP_SPEC = (1 << 2), // not (SEP bit set iff KSK)
DNSKEY_GENERATE_SEP_ON = (1 << 3), // SEP bit set on
} kdnssec_generate_flags_t;
void normalize_generate_flags(kdnssec_generate_flags_t *flags);
/*!
* \brief Generate new key, store all details in new kasp key structure.
*
* \param ctx kasp context
* \param flags determine if to use the key as KSK and/or ZSK and SEP flag
* \param key_ptr output if KNOT_EOK: new pointer to generated key
*
* \return KNOT_E*
*/
int kdnssec_generate_key(kdnssec_ctx_t *ctx, kdnssec_generate_flags_t flags,
knot_kasp_key_t **key_ptr);
/*!
* \brief Take a key from another zone (copying info, sharing privkey).
*
* \param ctx kasp context
* \param from_zone name of the zone to take from
* \param key_id ID of the key to take
*
* \return KNOT_E*
*/
int kdnssec_share_key(kdnssec_ctx_t *ctx, const knot_dname_t *from_zone, const char *key_id);
/*!
* \brief Remove key from zone.
*
* Deletes the key in keystore, unlinks the key from the zone in KASP db,
* moreover if no more zones use this key in KASP db, deletes it completely there
* and deletes it also from key storage (PKCS8dir/PKCS11).
*
* \param ctx kasp context (zone, keystore, kaspdb) to be modified
* \param key_ptr pointer to key to be removed, must be inside keystore structure, NOT a copy of it!
*
* \return KNOT_E*
*/
int kdnssec_delete_key(kdnssec_ctx_t *ctx, knot_kasp_key_t *key_ptr);
/*!
* \brief Load zone keys and init cryptographic context.
*
* \param ctx Zone signing context.
* \param keyset_ptr Resulting zone keyset.
* \param verbose Print key summary into log.
*
* \return Error code, KNOT_EOK if successful.
*/
int load_zone_keys(kdnssec_ctx_t *ctx, zone_keyset_t *keyset_ptr, bool verbose);
/*!
* \brief Free structure with zone keys and associated DNSSEC contexts.
*
* \param keyset Zone keys.
*/
void free_zone_keys(zone_keyset_t *keyset);
/*!
* \brief Get timestamp of next key event.
*
* \param keyset Zone keys.
*
* \return Timestamp of next key event.
*/
knot_time_t knot_get_next_zone_key_event(const zone_keyset_t *keyset);
/*!
* \brief Returns DS record rdata for given key.
*
* This function caches the results, so calling again with the same key returns immediately.
*
* \param for_key The key to compute DS for.
* \param digesttype DS digest algorithm.
* \param out_donotfree Output: the DS record rdata. Do not call dnssec_binary_free() on this ever.
*
* \return Error code, KNOT_EOK if successful.
*/
int zone_key_calculate_ds(zone_key_t *for_key, dnssec_key_digest_t digesttype,
dnssec_binary_t *out_donotfree);
/*!
* \brief Initialize local signing context.
*
* \param keyset Key set.
* \param dnssec_ctx DNSSEC context.
*
* \return New local signing context or NULL.
*/
zone_sign_ctx_t *zone_sign_ctx(const zone_keyset_t *keyset, const kdnssec_ctx_t *dnssec_ctx);
/*!
* \brief Initialize local validating context.
* \param dnssec_ctx DNSSEC context.
* \return New local validating context or NULL.
*/
zone_sign_ctx_t *zone_validation_ctx(const kdnssec_ctx_t *dnssec_ctx);
/*!
* \brief Free local signing context.
*
* \note This doesn't free the underlying keyset.
*
* \param ctx Local context to be freed.
*/
void zone_sign_ctx_free(zone_sign_ctx_t *ctx);
/*!
* \brief Create key signing structure from DNSKEY zone record.
*
* \param key Dnssec key to be allocated.
* \param owner Zone name.
* \param rdata DNSKEY rdata.
* \param rdlen DNSKEY rdata length.
*
* \return KNOT_E*
*/
int dnssec_key_from_rdata(dnssec_key_t **key, const knot_dname_t *owner,
const uint8_t *rdata, size_t rdlen);
/*!
* \brief Tell if apex SOA is signed by all active ZSKs.
*
* \param keyset Zone key set.
* \param apex_rrsig Apex RRSIG RRSet.
*/
int is_soa_signed_by_all_zsks(const zone_keyset_t *keyset,
const knot_rdataset_t *apex_rrsig);
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