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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