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resolved: make sure configured NTAs affect subdomains too

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This ensures that configured NTAs exclude not only the listed domain but
also all domains below it from DNSSEC validation -- except if a positive
trust anchor is defined below (as suggested by RFC7647, section 1.1)

Fixes: #5048
This commit is contained in:
Lennart Poettering 2017-02-14 17:28:17 +01:00
parent f73e6ee687
commit c775838ad7
1 changed files with 24 additions and 1 deletions
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25
src/resolve/resolved-dns-trust-anchor.c
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@ -547,10 +547,33 @@ int dns_trust_anchor_lookup_positive(DnsTrustAnchor *d, const DnsResourceKey *ke
} }
int dns_trust_anchor_lookup_negative(DnsTrustAnchor *d, const char *name) { int dns_trust_anchor_lookup_negative(DnsTrustAnchor *d, const char *name) {
int r;
assert(d); assert(d);
assert(name); assert(name);
return set_contains(d->negative_by_name, name); for (;;) {
/* If the domain is listed as-is in the NTA database, then that counts */
if (set_contains(d->negative_by_name, name))
return true;
/* If the domain isn't listed as NTA, but is listed as positive trust anchor, then that counts. See RFC
* 7646, section 1.1 */
if (hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, name)))
return false;
if (hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_KEY, name)))
return false;
/* And now, let's look at the parent, and check that too */
r = dns_name_parent(&name);
if (r < 0)
return r;
if (r == 0)
break;
}
return false;
} }
static int dns_trust_anchor_revoked_put(DnsTrustAnchor *d, DnsResourceRecord *rr) { static int dns_trust_anchor_revoked_put(DnsTrustAnchor *d, DnsResourceRecord *rr) {