183 lines
6.8 KiB
C
183 lines
6.8 KiB
C
/*
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* validator/val_nsec.h - validator NSEC 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 NSEC checking, the different NSEC proofs
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* for denial of existence, and proofs for presence of types.
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*/
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#ifndef VALIDATOR_VAL_NSEC_H
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#define VALIDATOR_VAL_NSEC_H
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#include "util/data/packed_rrset.h"
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struct val_env;
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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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/**
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* Check DS absence.
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* There is a NODATA reply to a DS that needs checking.
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* NSECs can prove this is not a delegation point, or successfully prove
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* that there is no DS. Or this fails.
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*
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* @param env: module env for rrsig verification routines.
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* @param ve: validator env for rrsig verification routines.
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* @param qinfo: the DS queried for.
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* @param rep: reply received.
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* @param kkey: key entry to use for verification of signatures.
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* @param proof_ttl: if secure, the TTL of how long this proof lasts.
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* @param reason: string explaining why bogus.
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* @return security status.
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* SECURE: proved absence of DS.
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* INSECURE: proved that this was not a delegation point.
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* BOGUS: crypto bad, or no absence of DS proven.
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* UNCHECKED: there was no way to prove anything (no NSECs, unknown algo).
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*/
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enum sec_status val_nsec_prove_nodata_dsreply(struct module_env* env,
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struct val_env* ve, struct query_info* qinfo,
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struct reply_info* rep, struct key_entry_key* kkey,
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time_t* proof_ttl, char** reason);
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/**
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* nsec typemap check, takes an NSEC-type bitmap as argument, checks for type.
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* @param bitmap: pointer to the bitmap part of wireformat rdata.
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* @param len: length of the bitmap, in bytes.
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* @param type: the type (in host order) to check for.
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* @return true if the type bit was set in the bitmap. false if not, or
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* if the bitmap was malformed in some way.
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*/
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int nsecbitmap_has_type_rdata(uint8_t* bitmap, size_t len, uint16_t type);
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/**
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* Check if type is present in the NSEC typemap
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* @param nsec: the nsec RRset.
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* If there are multiple RRs, then each must have the same typemap,
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* since the typemap represents the types at this domain node.
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* @param type: type to check for, host order.
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* @return true if present
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*/
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int nsec_has_type(struct ub_packed_rrset_key* nsec, uint16_t type);
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/**
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* Determine if a NSEC proves the NOERROR/NODATA conditions. This will also
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* handle the empty non-terminal (ENT) case and partially handle the
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* wildcard case. If the ownername of 'nsec' is a wildcard, the validator
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* must still be provided proof that qname did not directly exist and that
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* the wildcard is, in fact, *.closest_encloser.
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*
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* @param nsec: the nsec record to check against.
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* @param qinfo: the query info.
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* @param wc: if the nodata is proven for a wildcard match, the wildcard
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* closest encloser is returned, else NULL (wc is unchanged).
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* This closest encloser must then match the nameerror given for the
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* nextcloser of qname.
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* @return true if NSEC proves this.
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*/
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int nsec_proves_nodata(struct ub_packed_rrset_key* nsec,
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struct query_info* qinfo, uint8_t** wc);
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/**
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* Determine if the given NSEC proves a NameError (NXDOMAIN) for a given
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* qname.
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*
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* @param nsec: the nsec to check
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* @param qname: what was queried.
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* @return true if proven.
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*/
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int val_nsec_proves_name_error(struct ub_packed_rrset_key* nsec,
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uint8_t* qname);
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/**
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* Determine if the given NSEC proves a positive wildcard response.
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* @param nsec: the nsec to check
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* @param qinf: what was queried.
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* @param wc: wildcard (without *. label)
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* @return true if proven.
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*/
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int val_nsec_proves_positive_wildcard(struct ub_packed_rrset_key* nsec,
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struct query_info* qinf, uint8_t* wc);
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/**
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* Determine closest encloser of a query name and the NSEC that covers it
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* (and thus disproved it).
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* A name error must have been proven already, otherwise this will be invalid.
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* @param qname: the name queried for.
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* @param nsec: the nsec RRset.
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* @return closest encloser dname or NULL on error (bad nsec RRset).
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*/
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uint8_t* nsec_closest_encloser(uint8_t* qname,
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struct ub_packed_rrset_key* nsec);
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/**
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* Determine if the given NSEC proves that a wildcard match does not exist.
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*
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* @param nsec: the nsec RRset.
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* @param qname: the name queried for.
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* @param qnamelen: length of qname.
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* @return true if proven.
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*/
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int val_nsec_proves_no_wc(struct ub_packed_rrset_key* nsec, uint8_t* qname,
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size_t qnamelen);
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/**
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* Determine the DLV result, what to do with NSEC DLV reply.
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* @param qinfo: what was queried for.
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* @param rep: the nonpositive reply.
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* @param nm: dlv lookup name, to adjust for new lookup name (if needed).
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* @param nm_len: length of lookup name.
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* @return 0 on error, 1 if a higher point is found.
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* If the higher point is above the dlv repo anchor, the qname does
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* not exist.
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*/
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int val_nsec_check_dlv(struct query_info* qinfo,
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struct reply_info* rep, uint8_t** nm, size_t* nm_len);
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/**
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* Determine if an nsec proves an insecure delegation towards the qname.
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* @param nsec: nsec rrset.
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* @param qinfo: what was queries for.
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* @return 0 if not, 1 if an NSEC that signals an insecure delegation to
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* the qname.
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*/
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int val_nsec_proves_insecuredelegation(struct ub_packed_rrset_key* nsec,
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struct query_info* qinfo);
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#endif /* VALIDATOR_VAL_NSEC_H */
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