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.
84 lines
2.3 KiB
C
84 lines
2.3 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 2014 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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#include "hashmap.h"
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typedef struct DnsZone {
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Hashmap *by_key;
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Hashmap *by_name;
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} DnsZone;
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typedef struct DnsZoneItem DnsZoneItem;
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typedef enum DnsZoneItemState DnsZoneItemState;
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#include "resolved-dns-answer.h"
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#include "resolved-dns-question.h"
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#include "resolved-dns-rr.h"
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#include "resolved-dns-transaction.h"
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/* RFC 4795 Section 2.8. suggests a TTL of 30s by default */
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#define LLMNR_DEFAULT_TTL (30)
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enum DnsZoneItemState {
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DNS_ZONE_ITEM_PROBING,
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DNS_ZONE_ITEM_ESTABLISHED,
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DNS_ZONE_ITEM_VERIFYING,
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DNS_ZONE_ITEM_WITHDRAWN,
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};
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struct DnsZoneItem {
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DnsScope *scope;
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DnsResourceRecord *rr;
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DnsZoneItemState state;
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unsigned block_ready;
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bool probing_enabled;
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LIST_FIELDS(DnsZoneItem, by_key);
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LIST_FIELDS(DnsZoneItem, by_name);
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DnsTransaction *probe_transaction;
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};
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void dns_zone_flush(DnsZone *z);
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int dns_zone_put(DnsZone *z, DnsScope *s, DnsResourceRecord *rr, bool probe);
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void dns_zone_remove_rr(DnsZone *z, DnsResourceRecord *rr);
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int dns_zone_lookup(DnsZone *z, DnsResourceKey *key, DnsAnswer **answer, DnsAnswer **soa, bool *tentative);
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void dns_zone_item_conflict(DnsZoneItem *i);
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void dns_zone_item_notify(DnsZoneItem *i);
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int dns_zone_check_conflicts(DnsZone *zone, DnsResourceRecord *rr);
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int dns_zone_verify_conflicts(DnsZone *zone, DnsResourceKey *key);
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void dns_zone_verify_all(DnsZone *zone);
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void dns_zone_item_probe_stop(DnsZoneItem *i);
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void dns_zone_dump(DnsZone *zone, FILE *f);
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bool dns_zone_is_empty(DnsZone *zone);
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