resolved-dns-dnssec.h revision 1d3db294fca96fff0a7f8cff4eeeb42460ac21ac
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
#pragma once
/***
This file is part of systemd.
Copyright 2015 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
typedef enum DnssecMode DnssecMode;
typedef enum DnssecResult DnssecResult;
#include "dns-domain.h"
#include "resolved-dns-answer.h"
#include "resolved-dns-rr.h"
enum DnssecMode {
/* No DNSSEC validation is done */
DNSSEC_NO,
/* Validate locally, if the server knows DO, but if not,
* don't. Don't trust the AD bit. If the server doesn't do
* DNSSEC properly, downgrade to non-DNSSEC operation. Of
* course, we then are vulnerable to a downgrade attack, but
* that's life and what is configured. */
DNSSEC_DOWNGRADE_OK,
/* Insist on DNSSEC server support, and rather fail than downgrading. */
DNSSEC_YES,
_DNSSEC_MODE_MAX,
_DNSSEC_MODE_INVALID = -1
};
enum DnssecResult {
/* These four are returned by dnssec_verify_rrset() */
DNSSEC_VALIDATED,
DNSSEC_INVALID,
DNSSEC_SIGNATURE_EXPIRED,
DNSSEC_UNSUPPORTED_ALGORITHM,
/* These two are added by dnssec_verify_rrset_search() */
DNSSEC_NO_SIGNATURE,
DNSSEC_MISSING_KEY,
/* These two are added by the DnsTransaction logic */
DNSSEC_UNSIGNED,
DNSSEC_FAILED_AUXILIARY,
DNSSEC_NSEC_MISMATCH,
DNSSEC_INCOMPATIBLE_SERVER,
_DNSSEC_RESULT_MAX,
_DNSSEC_RESULT_INVALID = -1
};
#define DNSSEC_CANONICAL_HOSTNAME_MAX (DNS_HOSTNAME_MAX + 2)
/* The longest digest we'll ever generate, of all digest algorithms we support */
#define DNSSEC_HASH_SIZE_MAX (MAX(20, 32))
int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey);
int dnssec_key_match_rrsig(const DnsResourceKey *key, DnsResourceRecord *rrsig);
int dnssec_verify_rrset(DnsAnswer *answer, DnsResourceKey *key, DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, usec_t realtime, DnssecResult *result);
int dnssec_verify_rrset_search(DnsAnswer *answer, DnsResourceKey *key, DnsAnswer *validated_dnskeys, usec_t realtime, DnssecResult *result);
int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds);
int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_ds);
int dnssec_has_rrsig(DnsAnswer *a, const DnsResourceKey *key);
uint16_t dnssec_keytag(DnsResourceRecord *dnskey);
int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max);
int dnssec_nsec3_hash(DnsResourceRecord *nsec3, const char *name, void *ret);
typedef enum DnssecNsecResult {
DNSSEC_NSEC_NO_RR, /* No suitable NSEC/NSEC3 RR found */
DNSSEC_NSEC_CNAME, /* Would be NODATA, but for the existence of a CNAME RR */
DNSSEC_NSEC_UNSUPPORTED_ALGORITHM,
DNSSEC_NSEC_NXDOMAIN,
DNSSEC_NSEC_NODATA,
DNSSEC_NSEC_FOUND,
DNSSEC_NSEC_OPTOUT,
} DnssecNsecResult;
int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated);
const char* dnssec_mode_to_string(DnssecMode m) _const_;
DnssecMode dnssec_mode_from_string(const char *s) _pure_;
const char* dnssec_result_to_string(DnssecResult m) _const_;
DnssecResult dnssec_result_from_string(const char *s) _pure_;