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dns
nsec3.h
/* * 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/lang.h> #include <isc/iterated_hash.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_hashname(dns_fixedname_t *result, unsigned char rethash[NSEC3_MAX_HASH_LENGTH], size_t *hash_length, dns_name_t *name, 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, 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, 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, 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, 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, dns_name_t *name, dns_diff_t *diff); isc_result_t dns_nsec3_delnsec3sx(dns_db_t *db, dns_dbversion_t *version, 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, dns_name_t* name, 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 */
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