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These files were pulled from the 1.6.3 release tarball. This new version builds against OpenSSL version 1.1 which will be the default in the new Debian Stable which is due to be released RealSoonNow (tm).
381 lines
14 KiB
C
381 lines
14 KiB
C
/*
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* validator/val_nsec3.h - validator NSEC3 denial of existence functions.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains helper functions for the validator module.
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* The functions help with NSEC3 checking, the different NSEC3 proofs
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* for denial of existence, and proofs for presence of types.
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*
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* NSEC3
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* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Hash Alg. | Flags | Iterations |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Salt Length | Salt /
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Hash Length | Next Hashed Owner Name /
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* / Type Bit Maps /
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* NSEC3PARAM
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* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Hash Alg. | Flags | Iterations |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Salt Length | Salt /
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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*/
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#ifndef VALIDATOR_VAL_NSEC3_H
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#define VALIDATOR_VAL_NSEC3_H
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#include "util/rbtree.h"
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#include "util/data/packed_rrset.h"
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struct val_env;
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struct regional;
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struct module_env;
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struct ub_packed_rrset_key;
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struct reply_info;
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struct query_info;
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struct key_entry_key;
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struct sldns_buffer;
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/**
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* 0 1 2 3 4 5 6 7
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* +-+-+-+-+-+-+-+-+
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* | |O|
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* +-+-+-+-+-+-+-+-+
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* The OPT-OUT bit in the NSEC3 flags field.
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* If enabled, there can be zero or more unsigned delegations in the span.
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* If disabled, there are zero unsigned delegations in the span.
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*/
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#define NSEC3_OPTOUT 0x01
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/**
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* The unknown flags in the NSEC3 flags field.
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* They must be zero, or the NSEC3 is ignored.
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*/
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#define NSEC3_UNKNOWN_FLAGS 0xFE
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/** The SHA1 hash algorithm for NSEC3 */
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#define NSEC3_HASH_SHA1 0x01
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/**
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* Determine if the set of NSEC3 records provided with a response prove NAME
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* ERROR. This means that the NSEC3s prove a) the closest encloser exists,
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* b) the direct child of the closest encloser towards qname doesn't exist,
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* and c) *.closest encloser does not exist.
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*
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* @param env: module environment with temporary region and buffer.
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* @param ve: validator environment, with iteration count settings.
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* @param list: array of RRsets, some of which are NSEC3s.
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* @param num: number of RRsets in the array to examine.
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* @param qinfo: query that is verified for.
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* @param kkey: key entry that signed the NSEC3s.
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* @return:
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* sec_status SECURE of the Name Error is proven by the NSEC3 RRs,
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* BOGUS if not, INSECURE if all of the NSEC3s could be validly ignored.
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*/
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enum sec_status
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nsec3_prove_nameerror(struct module_env* env, struct val_env* ve,
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struct ub_packed_rrset_key** list, size_t num,
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struct query_info* qinfo, struct key_entry_key* kkey);
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/**
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* Determine if the NSEC3s provided in a response prove the NOERROR/NODATA
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* status. There are a number of different variants to this:
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*
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* 1) Normal NODATA -- qname is matched to an NSEC3 record, type is not
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* present.
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*
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* 2) ENT NODATA -- because there must be NSEC3 record for
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* empty-non-terminals, this is the same as #1.
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*
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* 3) NSEC3 ownername NODATA -- qname matched an existing, lone NSEC3
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* ownername, but qtype was not NSEC3. NOTE: as of nsec-05, this case no
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* longer exists.
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*
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* 4) Wildcard NODATA -- A wildcard matched the name, but not the type.
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*
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* 5) Opt-In DS NODATA -- the qname is covered by an opt-in span and qtype ==
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* DS. (or maybe some future record with the same parent-side-only property)
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*
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* @param env: module environment with temporary region and buffer.
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* @param ve: validator environment, with iteration count settings.
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* @param list: array of RRsets, some of which are NSEC3s.
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* @param num: number of RRsets in the array to examine.
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* @param qinfo: query that is verified for.
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* @param kkey: key entry that signed the NSEC3s.
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* @return:
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* sec_status SECURE of the proposition is proven by the NSEC3 RRs,
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* BOGUS if not, INSECURE if all of the NSEC3s could be validly ignored.
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*/
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enum sec_status
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nsec3_prove_nodata(struct module_env* env, struct val_env* ve,
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struct ub_packed_rrset_key** list, size_t num,
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struct query_info* qinfo, struct key_entry_key* kkey);
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/**
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* Prove that a positive wildcard match was appropriate (no direct match
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* RRset).
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*
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* @param env: module environment with temporary region and buffer.
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* @param ve: validator environment, with iteration count settings.
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* @param list: array of RRsets, some of which are NSEC3s.
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* @param num: number of RRsets in the array to examine.
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* @param qinfo: query that is verified for.
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* @param kkey: key entry that signed the NSEC3s.
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* @param wc: The purported wildcard that matched. This is the wildcard name
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* as *.wildcard.name., with the *. label already removed.
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* @return:
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* sec_status SECURE of the proposition is proven by the NSEC3 RRs,
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* BOGUS if not, INSECURE if all of the NSEC3s could be validly ignored.
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*/
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enum sec_status
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nsec3_prove_wildcard(struct module_env* env, struct val_env* ve,
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struct ub_packed_rrset_key** list, size_t num,
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struct query_info* qinfo, struct key_entry_key* kkey, uint8_t* wc);
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/**
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* Prove that a DS response either had no DS, or wasn't a delegation point.
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*
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* Fundamentally there are two cases here: normal NODATA and Opt-In NODATA.
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*
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* @param env: module environment with temporary region and buffer.
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* @param ve: validator environment, with iteration count settings.
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* @param list: array of RRsets, some of which are NSEC3s.
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* @param num: number of RRsets in the array to examine.
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* @param qinfo: query that is verified for.
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* @param kkey: key entry that signed the NSEC3s.
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* @param reason: string for bogus result.
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* @return:
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* sec_status SECURE of the proposition is proven by the NSEC3 RRs,
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* BOGUS if not, INSECURE if all of the NSEC3s could be validly ignored.
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* or if there was no DS in an insecure (i.e., opt-in) way,
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* INDETERMINATE if it was clear that this wasn't a delegation point.
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*/
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enum sec_status
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nsec3_prove_nods(struct module_env* env, struct val_env* ve,
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struct ub_packed_rrset_key** list, size_t num,
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struct query_info* qinfo, struct key_entry_key* kkey, char** reason);
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/**
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* Prove NXDOMAIN or NODATA.
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*
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* @param env: module environment with temporary region and buffer.
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* @param ve: validator environment, with iteration count settings.
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* @param list: array of RRsets, some of which are NSEC3s.
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* @param num: number of RRsets in the array to examine.
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* @param qinfo: query that is verified for.
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* @param kkey: key entry that signed the NSEC3s.
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* @param nodata: if return value is secure, this indicates if nodata or
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* nxdomain was proven.
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* @return:
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* sec_status SECURE of the proposition is proven by the NSEC3 RRs,
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* BOGUS if not, INSECURE if all of the NSEC3s could be validly ignored.
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*/
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enum sec_status
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nsec3_prove_nxornodata(struct module_env* env, struct val_env* ve,
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struct ub_packed_rrset_key** list, size_t num,
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struct query_info* qinfo, struct key_entry_key* kkey, int* nodata);
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/**
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* The NSEC3 hash result storage.
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* Consists of an rbtree, with these nodes in it.
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* The nodes detail how a set of parameters (from nsec3 rr) plus
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* a dname result in a hash.
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*/
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struct nsec3_cached_hash {
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/** rbtree node, key is this structure */
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rbnode_type node;
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/** where are the parameters for conversion, in this rrset data */
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struct ub_packed_rrset_key* nsec3;
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/** where are the parameters for conversion, this RR number in data */
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int rr;
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/** the name to convert */
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uint8_t* dname;
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/** length of the dname */
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size_t dname_len;
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/** the hash result (not base32 encoded) */
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uint8_t* hash;
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/** length of hash in bytes */
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size_t hash_len;
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/** the hash result in base32 encoding */
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uint8_t* b32;
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/** length of base32 encoding (as a label) */
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size_t b32_len;
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};
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/**
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* Rbtree for hash cache comparison function.
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* @param c1: key 1.
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* @param c2: key 2.
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* @return: comparison code, -1, 0, 1, of the keys.
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*/
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int nsec3_hash_cmp(const void* c1, const void* c2);
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/**
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* Obtain the hash of an owner name.
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* Used internally by the nsec3 proof functions in this file.
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* published to enable unit testing of hash algorithms and cache.
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*
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* @param table: the cache table. Must be initialised at start.
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* @param region: scratch region to use for allocation.
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* This region holds the tree, if you wipe the region, reinit the tree.
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* @param buf: temporary buffer.
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* @param nsec3: the rrset with parameters
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* @param rr: rr number from d that has the NSEC3 parameters to hash to.
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* @param dname: name to hash
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* This pointer is used inside the tree, assumed region-alloced.
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* @param dname_len: the length of the name.
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* @param hash: the hash node is returned on success.
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* @return:
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* 1 on success, either from cache or newly hashed hash is returned.
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* 0 on a malloc failure.
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* -1 if the NSEC3 rr was badly formatted (i.e. formerr).
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*/
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int nsec3_hash_name(rbtree_type* table, struct regional* region,
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struct sldns_buffer* buf, struct ub_packed_rrset_key* nsec3, int rr,
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uint8_t* dname, size_t dname_len, struct nsec3_cached_hash** hash);
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/**
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* Get next owner name, converted to base32 encoding and with the
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* zone name (taken from the nsec3 owner name) appended.
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* @param rrset: the NSEC3 rrset.
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* @param r: the rr num of the nsec3 in the rrset.
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* @param buf: buffer to store name in
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* @param max: size of buffer.
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* @return length of name on success. 0 on failure (buffer too short or
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* bad format nsec3 record).
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*/
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size_t nsec3_get_nextowner_b32(struct ub_packed_rrset_key* rrset, int r,
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uint8_t* buf, size_t max);
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/**
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* Convert hash into base32 encoding and with the
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* zone name appended.
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* @param hash: hashed buffer
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* @param hashlen: length of hash
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* @param zone: name of zone
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* @param zonelen: length of zonename.
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* @param buf: buffer to store name in
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* @param max: size of buffer.
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* @return length of name on success. 0 on failure (buffer too short or
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* bad format nsec3 record).
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*/
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size_t nsec3_hash_to_b32(uint8_t* hash, size_t hashlen, uint8_t* zone,
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size_t zonelen, uint8_t* buf, size_t max);
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/**
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* Get NSEC3 parameters out of rr.
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* @param rrset: the NSEC3 rrset.
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* @param r: the rr num of the nsec3 in the rrset.
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* @param algo: nsec3 hash algo.
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* @param iter: iteration count.
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* @param salt: ptr to salt inside rdata.
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* @param saltlen: length of salt.
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* @return 0 if bad formatted, unknown nsec3 hash algo, or unknown flags set.
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*/
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int nsec3_get_params(struct ub_packed_rrset_key* rrset, int r,
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int* algo, size_t* iter, uint8_t** salt, size_t* saltlen);
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/**
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* Get NSEC3 hashed in a buffer
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* @param buf: buffer for temp use.
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* @param nm: name to hash
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* @param nmlen: length of nm.
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* @param algo: algo to use, must be known.
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* @param iter: iterations
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* @param salt: salt for nsec3
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* @param saltlen: length of salt.
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* @param res: result of hash stored here.
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* @param max: maximum space for result.
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* @return 0 on failure, otherwise bytelength stored.
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*/
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size_t nsec3_get_hashed(struct sldns_buffer* buf, uint8_t* nm, size_t nmlen,
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int algo, size_t iter, uint8_t* salt, size_t saltlen, uint8_t* res,
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size_t max);
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/**
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* see if NSEC3 RR contains given type
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* @param rrset: NSEC3 rrset
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* @param r: RR in rrset
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* @param type: in host order to check bit for.
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* @return true if bit set, false if not or error.
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*/
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int nsec3_has_type(struct ub_packed_rrset_key* rrset, int r, uint16_t type);
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/**
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* return if nsec3 RR has the optout flag
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* @param rrset: NSEC3 rrset
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* @param r: RR in rrset
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* @return true if optout, false on error or not optout
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*/
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int nsec3_has_optout(struct ub_packed_rrset_key* rrset, int r);
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/**
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* Return nsec3 RR next hashed owner name
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* @param rrset: NSEC3 rrset
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* @param r: RR in rrset
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* @param next: ptr into rdata to next owner hash
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* @param nextlen: length of hash.
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* @return false on malformed
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*/
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int nsec3_get_nextowner(struct ub_packed_rrset_key* rrset, int r,
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uint8_t** next, size_t* nextlen);
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/**
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* nsec3Covers
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* Given a hash and a candidate NSEC3Record, determine if that NSEC3Record
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* covers the hash. Covers specifically means that the hash is in between
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* the owner and next hashes and does not equal either.
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*
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* @param zone: the zone name.
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* @param hash: the hash of the name
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* @param rrset: the rrset of the NSEC3.
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* @param rr: which rr in the rrset.
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* @param buf: temporary buffer.
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* @return true if covers, false if not.
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*/
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int nsec3_covers(uint8_t* zone, struct nsec3_cached_hash* hash,
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struct ub_packed_rrset_key* rrset, int rr, struct sldns_buffer* buf);
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#endif /* VALIDATOR_VAL_NSEC3_H */
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