/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef DNS_NSEC3_H
#define DNS_NSEC3_H 1
#include <stdbool.h>
#include <isc/iterated_hash.h>
#include <isc/lang.h>
#include <isc/log.h>
#include <dns/db.h>
#include <dns/diff.h>
#include <dns/name.h>
#include <dns/rdatastruct.h>
#include <dns/types.h>
#define DNS_NSEC3_SALTSIZE 255
#define DNS_NSEC3_MAXITERATIONS 150U
/*
* hash = 1, flags =1, iterations = 2, salt length = 1, salt = 255 (max)
* hash length = 1, hash = 255 (max), bitmap = 8192 + 512 (max)
*/
#define DNS_NSEC3_BUFFERSIZE (6 + 255 + 255 + 8192 + 512)
/*
* hash = 1, flags = 1, iterations = 2, salt length = 1, salt = 255 (max)
*/
#define DNS_NSEC3PARAM_BUFFERSIZE (5 + 255)
/*
* Test "unknown" algorithm. Is mapped to dns_hash_sha1.
*/
#define DNS_NSEC3_UNKNOWNALG ((dns_hash_t)245U)
ISC_LANG_BEGINDECLS
isc_result_t
dns_nsec3_buildrdata(dns_db_t *db, dns_dbversion_t *version, dns_dbnode_t *node,
unsigned int hashalg, unsigned int optin,
unsigned int iterations, const unsigned char *salt,
size_t salt_length, const unsigned char *nexthash,
size_t hash_length, unsigned char *buffer,
dns_rdata_t *rdata);
/*%<
* Build the rdata of a NSEC3 record for the data at 'node'.
* Note: 'node' is not the node where the NSEC3 record will be stored.
*
* Requires:
* buffer Points to a temporary buffer of at least
* DNS_NSEC_BUFFERSIZE bytes.
* rdata Points to an initialized dns_rdata_t.
*
* Ensures:
* *rdata Contains a valid NSEC3 rdata. The 'data' member refers
* to 'buffer'.
*/
bool
dns_nsec3_typepresent(dns_rdata_t *nsec, dns_rdatatype_t type);
/*%<
* Determine if a type is marked as present in an NSEC3 record.
*
* Requires:
* 'nsec' points to a valid rdataset of type NSEC3
*/
isc_result_t
dns_nsec3_generate_salt(unsigned char *salt, size_t saltlen);
/*%<
* Generate a salt with the given salt length.
*/
isc_result_t
dns_nsec3_hashname(dns_fixedname_t *result,
unsigned char rethash[NSEC3_MAX_HASH_LENGTH],
size_t *hash_length, const dns_name_t *name,
const dns_name_t *origin, dns_hash_t hashalg,
unsigned int iterations, const unsigned char *salt,
size_t saltlength);
/*%<
* Make a hashed domain name from an unhashed one. If rethash is not NULL
* the raw hash is stored there.
*/
unsigned int
dns_nsec3_hashlength(dns_hash_t hash);
/*%<
* Return the length of the hash produced by the specified algorithm
* or zero when unknown.
*/
bool
dns_nsec3_supportedhash(dns_hash_t hash);
/*%<
* Return whether we support this hash algorithm or not.
*/
isc_result_t
dns_nsec3_addnsec3(dns_db_t *db, dns_dbversion_t *version,
const dns_name_t *name,
const dns_rdata_nsec3param_t *nsec3param, dns_ttl_t nsecttl,
bool unsecure, dns_diff_t *diff);
isc_result_t
dns_nsec3_addnsec3s(dns_db_t *db, dns_dbversion_t *version,
const dns_name_t *name, dns_ttl_t nsecttl, bool unsecure,
dns_diff_t *diff);
isc_result_t
dns_nsec3_addnsec3sx(dns_db_t *db, dns_dbversion_t *version,
const dns_name_t *name, dns_ttl_t nsecttl, bool unsecure,
dns_rdatatype_t private, dns_diff_t *diff);
/*%<
* Add NSEC3 records for 'name', recording the change in 'diff'.
* Adjust previous NSEC3 records, if any, to reflect the addition.
* The existing NSEC3 records are removed.
*
* dns_nsec3_addnsec3() will only add records to the chain identified by
* 'nsec3param'.
*
* 'unsecure' should be set to reflect if this is a potentially
* unsecure delegation (no DS record).
*
* dns_nsec3_addnsec3s() will examine the NSEC3PARAM RRset to determine which
* chains to be updated. NSEC3PARAM records with the DNS_NSEC3FLAG_CREATE
* will be preferentially chosen over NSEC3PARAM records without
* DNS_NSEC3FLAG_CREATE set. NSEC3PARAM records with DNS_NSEC3FLAG_REMOVE
* set will be ignored by dns_nsec3_addnsec3s(). If DNS_NSEC3FLAG_CREATE
* is set then the new NSEC3 will have OPTOUT set to match the that in the
* NSEC3PARAM record otherwise OPTOUT will be inherited from the previous
* record in the chain.
*
* dns_nsec3_addnsec3sx() is similar to dns_nsec3_addnsec3s() but 'private'
* specifies the type of the private rdataset to be checked in addition to
* the nsec3param rdataset at the zone apex.
*
* Requires:
* 'db' to be valid.
* 'version' to be valid or NULL.
* 'name' to be valid.
* 'nsec3param' to be valid.
* 'diff' to be valid.
*/
isc_result_t
dns_nsec3_delnsec3(dns_db_t *db, dns_dbversion_t *version,
const dns_name_t *name,
const dns_rdata_nsec3param_t *nsec3param, dns_diff_t *diff);
isc_result_t
dns_nsec3_delnsec3s(dns_db_t *db, dns_dbversion_t *version,
const dns_name_t *name, dns_diff_t *diff);
isc_result_t
dns_nsec3_delnsec3sx(dns_db_t *db, dns_dbversion_t *version,
const dns_name_t *name, dns_rdatatype_t private,
dns_diff_t *diff);
/*%<
* Remove NSEC3 records for 'name', recording the change in 'diff'.
* Adjust previous NSEC3 records, if any, to reflect the removal.
*
* dns_nsec3_delnsec3() performs the above for the chain identified by
* 'nsec3param'.
*
* dns_nsec3_delnsec3s() examines the NSEC3PARAM RRset in a similar manner
* to dns_nsec3_addnsec3s(). Unlike dns_nsec3_addnsec3s() updated NSEC3
* records have the OPTOUT flag preserved.
*
* dns_nsec3_delnsec3sx() is similar to dns_nsec3_delnsec3s() but 'private'
* specifies the type of the private rdataset to be checked in addition to
* the nsec3param rdataset at the zone apex.
*
* Requires:
* 'db' to be valid.
* 'version' to be valid or NULL.
* 'name' to be valid.
* 'nsec3param' to be valid.
* 'diff' to be valid.
*/
isc_result_t
dns_nsec3_active(dns_db_t *db, dns_dbversion_t *version, bool complete,
bool *answer);
isc_result_t
dns_nsec3_activex(dns_db_t *db, dns_dbversion_t *version, bool complete,
dns_rdatatype_t private, bool *answer);
/*%<
* Check if there are any complete/to be built NSEC3 chains.
* If 'complete' is true only complete chains will be recognized.
*
* dns_nsec3_activex() is similar to dns_nsec3_active() but 'private'
* specifies the type of the private rdataset to be checked in addition to
* the nsec3param rdataset at the zone apex.
*
* Requires:
* 'db' to be valid.
* 'version' to be valid or NULL.
* 'answer' to be non NULL.
*/
unsigned int
dns_nsec3_maxiterations(void);
/*%<
* Return the maximum permissible number of NSEC3 iterations.
*/
bool
dns_nsec3param_fromprivate(dns_rdata_t *src, dns_rdata_t *target,
unsigned char *buf, size_t buflen);
/*%<
* Convert a private rdata to a nsec3param rdata.
*
* Return true if 'src' could be successfully converted.
*
* 'buf' should be at least DNS_NSEC3PARAM_BUFFERSIZE in size.
*/
void
dns_nsec3param_toprivate(dns_rdata_t *src, dns_rdata_t *target,
dns_rdatatype_t privatetype, unsigned char *buf,
size_t buflen);
/*%<
* Convert a nsec3param rdata to a private rdata.
*
* 'buf' should be at least src->length + 1 in size.
*/
isc_result_t
dns_nsec3param_salttotext(dns_rdata_nsec3param_t *nsec3param, char *dst,
size_t dstlen);
/*%<
* Convert the salt of given NSEC3PARAM RDATA into hex-encoded, NULL-terminated
* text stored at "dst".
*
* Requires:
*
*\li "dst" to have enough space (as indicated by "dstlen") to hold the
* resulting text and its NULL-terminating byte.
*/
isc_result_t
dns_nsec3param_deletechains(dns_db_t *db, dns_dbversion_t *ver,
dns_zone_t *zone, bool nonsec, dns_diff_t *diff);
/*%<
* Mark NSEC3PARAM for deletion.
*/
isc_result_t
dns_nsec3_noexistnodata(dns_rdatatype_t type, const dns_name_t *name,
const dns_name_t *nsec3name, dns_rdataset_t *nsec3set,
dns_name_t *zonename, bool *exists, bool *data,
bool *optout, bool *unknown, bool *setclosest,
bool *setnearest, dns_name_t *closest,
dns_name_t *nearest, dns_nseclog_t logit, void *arg);
ISC_LANG_ENDDECLS
#endif /* DNS_NSEC3_H */
