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/* Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include "lib/rules/impl.h"
#include "lib/rules/api.h"
#include "lib/utils.h"
#define CHECK_RET(ret) do { \
if ((ret) < 0) { kr_assert(false); return kr_error((ret)); } \
} while (false)
/** RFC-defined local zones should be quite static,
* so we use a higher TTL separate from KR_RULE_TTL_DEFAULT. */
#define TTL ((uint32_t)3600)
int rules_defaults_insert(void)
{
static const char * names[] = {
/* RFC1918 Private, local, broadcast, test and special zones
Considerations: RFC6761, sec 6.1.
https://www.iana.org/assignments/locally-served-dns-zones
*/
/* RFC6303 */
"10.in-addr.arpa.",
"16.172.in-addr.arpa.",
"17.172.in-addr.arpa.",
"18.172.in-addr.arpa.",
"19.172.in-addr.arpa.",
"20.172.in-addr.arpa.",
"21.172.in-addr.arpa.",
"22.172.in-addr.arpa.",
"23.172.in-addr.arpa.",
"24.172.in-addr.arpa.",
"25.172.in-addr.arpa.",
"26.172.in-addr.arpa.",
"27.172.in-addr.arpa.",
"28.172.in-addr.arpa.",
"29.172.in-addr.arpa.",
"30.172.in-addr.arpa.",
"31.172.in-addr.arpa.",
"168.192.in-addr.arpa.",
"0.in-addr.arpa.",
"127.in-addr.arpa.",
"254.169.in-addr.arpa.",
"2.0.192.in-addr.arpa.",
"100.51.198.in-addr.arpa.",
"113.0.203.in-addr.arpa.",
"255.255.255.255.in-addr.arpa.",
/* RFC7793 */
"64.100.in-addr.arpa.",
"65.100.in-addr.arpa.",
"66.100.in-addr.arpa.",
"67.100.in-addr.arpa.",
"68.100.in-addr.arpa.",
"69.100.in-addr.arpa.",
"70.100.in-addr.arpa.",
"71.100.in-addr.arpa.",
"72.100.in-addr.arpa.",
"73.100.in-addr.arpa.",
"74.100.in-addr.arpa.",
"75.100.in-addr.arpa.",
"76.100.in-addr.arpa.",
"77.100.in-addr.arpa.",
"78.100.in-addr.arpa.",
"79.100.in-addr.arpa.",
"80.100.in-addr.arpa.",
"81.100.in-addr.arpa.",
"82.100.in-addr.arpa.",
"83.100.in-addr.arpa.",
"84.100.in-addr.arpa.",
"85.100.in-addr.arpa.",
"86.100.in-addr.arpa.",
"87.100.in-addr.arpa.",
"88.100.in-addr.arpa.",
"89.100.in-addr.arpa.",
"90.100.in-addr.arpa.",
"91.100.in-addr.arpa.",
"92.100.in-addr.arpa.",
"93.100.in-addr.arpa.",
"94.100.in-addr.arpa.",
"95.100.in-addr.arpa.",
"96.100.in-addr.arpa.",
"97.100.in-addr.arpa.",
"98.100.in-addr.arpa.",
"99.100.in-addr.arpa.",
"100.100.in-addr.arpa.",
"101.100.in-addr.arpa.",
"102.100.in-addr.arpa.",
"103.100.in-addr.arpa.",
"104.100.in-addr.arpa.",
"105.100.in-addr.arpa.",
"106.100.in-addr.arpa.",
"107.100.in-addr.arpa.",
"108.100.in-addr.arpa.",
"109.100.in-addr.arpa.",
"110.100.in-addr.arpa.",
"111.100.in-addr.arpa.",
"112.100.in-addr.arpa.",
"113.100.in-addr.arpa.",
"114.100.in-addr.arpa.",
"115.100.in-addr.arpa.",
"116.100.in-addr.arpa.",
"117.100.in-addr.arpa.",
"118.100.in-addr.arpa.",
"119.100.in-addr.arpa.",
"120.100.in-addr.arpa.",
"121.100.in-addr.arpa.",
"122.100.in-addr.arpa.",
"123.100.in-addr.arpa.",
"124.100.in-addr.arpa.",
"125.100.in-addr.arpa.",
"126.100.in-addr.arpa.",
"127.100.in-addr.arpa.",
/* RFC6303 */
"0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.",
"1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.",
/* ^ below we inject exact-match PTR over this empty zone */
"d.f.ip6.arpa.",
"8.e.f.ip6.arpa.",
"9.e.f.ip6.arpa.",
"a.e.f.ip6.arpa.",
"b.e.f.ip6.arpa.",
"8.b.d.0.1.0.0.2.ip6.arpa.",
/* RFC8375 */
"home.arpa.",
/* More zones - empty-zone subset from:
https://www.iana.org/assignments/special-use-domain-names
TODO: perhaps review the list again.
*/
"test.",
"onion.",
"invalid.",
"local.", // RFC 8375.4
};
const int names_count = sizeof(names) / sizeof(names[0]);
for (int i = 0; i < names_count; ++i) {
knot_dname_t name_buf[KNOT_DNAME_MAXLEN];
const knot_dname_t *dname =
knot_dname_from_str(name_buf, names[i], sizeof(name_buf));
int ret = kr_rule_local_subtree(dname, KR_RULE_SUB_EMPTY,
TTL, KR_RULE_TAGS_ALL);
CHECK_RET(ret);
/* The double conversion is perhaps a bit wasteful, but it should be rare. */
/* LATER: add extra info with explanation? policy module had an ADDITIONAL
* record with explanation, but perhaps extended errors are more suitable?
* Differentiating the message - perhaps splitting KR_RULE_SUB_EMPTY into a few?
*/
}
knot_dname_t localhost_dname[] = "\x09localhost\0";
{ // forward localhost
int ret = kr_rule_local_subtree(localhost_dname, KR_RULE_SUB_REDIRECT,
TTL, KR_RULE_TAGS_ALL);
CHECK_RET(ret);
knot_rrset_t rr = {
.owner = localhost_dname,
.ttl = TTL,
.rclass = KNOT_CLASS_IN,
.rrs = { 0 },
.additional = NULL,
};
rr.type = KNOT_RRTYPE_A;
ret = knot_rrset_add_rdata(&rr, (const uint8_t *)"\x7f\0\0\1", 4, NULL);
if (!ret) ret = kr_rule_local_data_ins(&rr, NULL, KR_RULE_TAGS_ALL);
knot_rdataset_clear(&rr.rrs, NULL);
CHECK_RET(ret);
rr.type = KNOT_RRTYPE_AAAA;
ret = knot_rrset_add_rdata(&rr,
(const uint8_t *)"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1",
16, NULL);
if (!ret) ret = kr_rule_local_data_ins(&rr, NULL, KR_RULE_TAGS_ALL);
knot_rdataset_clear(&rr.rrs, NULL);
CHECK_RET(ret);
rr.type = KNOT_RRTYPE_NS;
ret = knot_rrset_add_rdata(&rr, localhost_dname, 1+9+1, NULL);
if (!ret) ret = kr_rule_local_data_ins(&rr, NULL, KR_RULE_TAGS_ALL);
knot_rdataset_clear(&rr.rrs, NULL);
CHECK_RET(ret);
}
{ // reverse localhost; LATER: the situation isn't ideal with NXDOMAIN + some exact matches
knot_rrset_t rr = {
.owner = localhost_dname,
.ttl = TTL,
.type = KNOT_RRTYPE_PTR,
.rclass = KNOT_CLASS_IN,
.rrs = { 0 },
.additional = NULL,
};
int ret = knot_rrset_add_rdata(&rr, localhost_dname, 1+9+1, NULL);
if (!ret) ret = kr_rule_local_data_ins(&rr, NULL, KR_RULE_TAGS_ALL);
knot_dname_t name_buf[KNOT_DNAME_MAXLEN];
rr.owner = knot_dname_from_str(name_buf,
"1.0.0.127.in-addr.arpa.",
sizeof(name_buf));
if (!ret) ret = kr_rule_local_data_ins(&rr, NULL, KR_RULE_TAGS_ALL);
rr.owner = knot_dname_from_str(name_buf,
"1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa.",
sizeof(name_buf));
if (!ret) ret = kr_rule_local_data_ins(&rr, NULL, KR_RULE_TAGS_ALL);
knot_rdataset_clear(&rr.rrs, NULL);
CHECK_RET(ret);
}
return kr_ok();
}
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