547973dea7
This adds initial support for validating RRSIG/DNSKEY/DS chains when doing lookups. Proof-of-non-existance, or proof-of-unsigned-zones is not implemented yet. With this change DnsTransaction objects will generate additional DnsTransaction objects when looking for DNSKEY or DS RRs to validate an RRSIG on a response. DnsTransaction objects are thus created for three reasons now: 1) Because a user asked for something to be resolved, i.e. requested by a DnsQuery/DnsQueryCandidate object. 2) As result of LLMNR RR probing, requested by a DnsZoneItem. 3) Because another DnsTransaction requires the requested RRs for validation of its own response. DnsTransactions are shared between all these users, and are GC automatically as soon as all of these users don't need a specific transaction anymore. To unify the handling of these three reasons for existance for a DnsTransaction, a new common naming is introduced: each DnsTransaction now tracks its "owners" via a Set* object named "notify_xyz", containing all owners to notify on completion. A new DnsTransaction state is introduced called "VALIDATING" that is entered after a response has been receieved which needs to be validated, as long as we are still waiting for the DNSKEY/DS RRs from other DnsTransactions. This patch will request the DNSKEY/DS RRs bottom-up, and then validate them top-down. Caching of RRs is now only done after verification, so that the cache is not poisoned with known invalid data. The "DnsAnswer" object gained a substantial number of new calls, since we need to add/remove RRs to it dynamically now.
77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2015 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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typedef enum DnssecMode DnssecMode;
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typedef enum DnssecResult DnssecResult;
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#include "dns-domain.h"
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#include "resolved-dns-answer.h"
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#include "resolved-dns-rr.h"
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enum DnssecMode {
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/* No DNSSEC validation is done */
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DNSSEC_NO,
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/* Trust the AD bit sent by the server. UNSAFE! */
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DNSSEC_TRUST,
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/* Validate locally, if the server knows DO, but if not, don't. Don't trust the AD bit */
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DNSSEC_YES,
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_DNSSEC_MODE_MAX,
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_DNSSEC_MODE_INVALID = -1
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};
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enum DnssecResult {
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DNSSEC_VALIDATED,
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DNSSEC_INVALID,
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DNSSEC_UNSIGNED,
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DNSSEC_NO_SIGNATURE,
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DNSSEC_MISSING_KEY,
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DNSSEC_SIGNATURE_EXPIRED,
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DNSSEC_FAILED_AUXILIARY,
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_DNSSEC_RESULT_MAX,
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_DNSSEC_RESULT_INVALID = -1
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};
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#define DNSSEC_CANONICAL_HOSTNAME_MAX (DNS_HOSTNAME_MAX + 2)
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int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey);
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int dnssec_key_match_rrsig(DnsResourceKey *key, DnsResourceRecord *rrsig);
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int dnssec_verify_rrset(DnsAnswer *answer, DnsResourceKey *key, DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, usec_t realtime, DnssecResult *result);
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int dnssec_verify_rrset_search(DnsAnswer *answer, DnsResourceKey *key, DnsAnswer *validated_dnskeys, usec_t realtime, DnssecResult *result);
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int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds);
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int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_ds);
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uint16_t dnssec_keytag(DnsResourceRecord *dnskey);
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int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max);
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const char* dnssec_mode_to_string(DnssecMode m) _const_;
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DnssecMode dnssec_mode_from_string(const char *s) _pure_;
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const char* dnssec_result_to_string(DnssecResult m) _const_;
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DnssecResult dnssec_result_from_string(const char *s) _pure_;
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